South China Sea Dispute

1. Introduction

The South China Sea Dispute is one of the most significant maritime and geopolitical disputes in the world, involving overlapping territorial and maritime claims by China, Taiwan, Vietnam, the Philippines, Malaysia, and Brunei. The South China Sea Issue centres on the ownership of islands, reefs, and surrounding waters, as well as rights over valuable marine resources and strategic sea lanes. Covering nearly 3.5 million sq. km, the South China Sea is a vital route for global trade, energy transportation, and naval operations.

The South China Sea Dispute has gained global significance due to China’s expansive territorial claims, increasing militarisation, competing interpretations of international maritime law, and the growing strategic rivalry between China and the United States. Consequently, it has become a major challenge to regional stability, the rules-based international order, and the security architecture of the Indo-Pacific.

2. Geographical and Strategic Significance of the South China Sea

Geographical Significance

The South China Sea Dispute involves a semi-enclosed sea located in the Western Pacific Ocean, covering an area of approximately 3.5 million sq. km. It is bordered by China, Taiwan, Vietnam, the Philippines, Malaysia, Brunei, and Indonesia (through its Exclusive Economic Zone near the Natuna Islands). The South China Sea Issue connects the Pacific Ocean with the Indian Ocean through important maritime passages such as the Strait of Malacca, Taiwan Strait, and Luzon Strait, making it one of the world’s busiest sea routes.

Strategic Importance for Global Trade

The South China Sea Dispute has major significance for global trade. The South China Sea serves as one of the world’s most important maritime trade corridors. Approximately one-third of global maritime trade, valued at an estimated US$3–5 trillion annually, passes through these waters. It is the principal shipping route connecting East Asia with Europe, the Middle East, and Africa, making uninterrupted navigation crucial for the global economy.

Energy Security

The region is believed to possess substantial reserves of crude oil and natural gas, making it strategically important for both claimant states and energy-importing countries. In addition to hydrocarbon resources, the South China Sea is the primary route for transporting oil and liquefied natural gas (LNG) from the Middle East to East Asian economies such as China, Japan, and South Korea. Therefore, any disruption in this region can significantly affect global energy security and intensify the South China Sea Dispute.

Rich Fisheries and Blue Economy

The South China Sea is among the world’s richest fishing grounds, supporting the livelihood of millions of people in coastal countries. It contributes significantly to regional food security and forms an important component of the Blue Economy, which promotes the sustainable use of marine resources for economic development.

Military and Geopolitical Significance

The South China Sea occupies a central position in the Indo-Pacific and is vital for naval mobility and strategic power projection. Control over the region enables countries to monitor key sea lanes, establish military bases, and influence maritime security. Consequently, the South China Sea Dispute has become a major arena of strategic competition between China and the United States, while also attracting increasing involvement from regional powers such as Japan, Australia, and India.

Thus, the South China Sea Dispute is not merely a disputed maritime region but a strategic crossroads where global trade, energy security, military competition, and international law converge, making it one of the most geopolitically sensitive regions in the world.

3. Evolution of the South China Sea Dispute

The South China Sea Dispute has evolved over several decades through historical claims, colonial legacies, competing national interests, and changing geopolitical dynamics. What began as a dispute over small islands has gradually transformed into a major strategic contest involving regional and global powers.

Historical Claims

China traces its claims over much of the South China Sea to historical records dating back several centuries, arguing that Chinese fishermen and traders have traditionally used these waters. Vietnam also cites historical evidence to support its sovereignty over the Paracel and Spratly Islands. Similar historical claims have been advanced by other claimant states, resulting in overlapping assertions of sovereignty and contributing to the South China Sea Issue.

Colonial Legacy and Post-World War II Developments

During the colonial period, different islands in the South China Sea came under the control of various colonial powers, including France and Japan. After the Second World War, Japan relinquished control over these territories, but no comprehensive international agreement clearly defined ownership. This created ambiguity and laid the foundation for future territorial disputes.

Emergence of China’s Nine-Dash Line

In 1947, the Republic of China published a map containing the Nine-Dash Line, claiming historic rights over almost 90% of the South China Sea. After the establishment of the People’s Republic of China in 1949, Beijing continued to uphold this claim. However, the Nine-Dash Line overlaps with the Exclusive Economic Zones (EEZs) claimed by several Southeast Asian countries under international law, making the Nine-Dash Line the central point of contention in the South China Sea Dispute.

Impact of UNCLOS

The adoption of the United Nations Convention on the Law of the Sea (UNCLOS) in 1982 significantly changed the legal framework governing maritime rights. UNCLOS introduced concepts such as the 12-nautical-mile Territorial Sea and the 200-nautical-mile Exclusive Economic Zone (EEZ). While countries such as the Philippines, Vietnam, Malaysia, and Brunei base their maritime claims on UNCLOS, China continues to rely largely on its historical claims, leading to conflicting interpretations of maritime rights. This has made South China Sea UNCLOS issues central to the South China Sea Dispute.

Intensification of the Dispute

From the 1990s onwards, the discovery of potential oil and natural gas reserves, growing dependence on marine resources, and increasing strategic competition intensified the dispute. China expanded its presence by constructing artificial islands, developing military infrastructure, and increasing coast guard and naval patrols. Other claimant states also strengthened their maritime capabilities, resulting in frequent confrontations at sea.

Militarisation and Internationalisation

In recent years, the South China Sea Dispute has become a major arena of U.S.–China strategic competition. The United States has increased Freedom of Navigation Operations (FONOPs) to challenge excessive maritime claims and uphold international law. At the same time, countries such as Japan, Australia, India, and several European nations have supported a free, open, and rules-based Indo-Pacific. Consequently, the South China Sea Issue has evolved from a regional territorial issue into a matter of global geopolitical significance.

The evolution of the South China Sea Dispute demonstrates how historical claims, legal interpretations, resource competition, and great-power rivalry have combined to create one of the most complex and strategically important maritime disputes in the contemporary world.

4. Why is the South China Sea Disputed?

The South China Sea Dispute is driven by a combination of overlapping territorial claims, competing interpretations of international law, abundant natural resources, strategic maritime location, and geopolitical rivalry. These factors have made the South China Sea Dispute one of the most complex maritime conflicts in the world.

Overlapping Territorial Claims

Several countries claim sovereignty over the islands, reefs, and surrounding waters of the South China Sea. China and Taiwan claim almost the entire sea based on historical assertions, while Vietnam, the Philippines, Malaysia, and Brunei claim parts of it under the provisions of UNCLOS. These overlapping claims have led to frequent diplomatic disputes and maritime confrontations, making the South China Sea Issue a major regional concern.

China’s Nine-Dash Line Claim

China’s Nine-Dash Line is the principal source of the South China Sea Dispute. It encloses nearly 90% of the South China Sea, extending far beyond China’s internationally recognised coastline. China argues that it possesses historic rights over these waters based on centuries of navigation and administration. However, the Nine-Dash Line overlaps with the Exclusive Economic Zones (EEZs) of neighbouring countries and has been widely challenged under international law.

Energy Resources

The South China Sea is believed to contain significant reserves of oil and natural gas, making it economically valuable. Control over these resources can enhance a country’s energy security and reduce dependence on imported fuels. Consequently, claimant states seek to strengthen their maritime claims to gain access to these potential hydrocarbon reserves.

Fisheries and Marine Resources

The region is one of the world’s richest fishing grounds and supports the livelihoods of millions of people. Fisheries are crucial for food security and employment in Southeast Asia. Increasing competition over declining fish stocks has intensified disputes among coastal states, leading to frequent confrontations between fishing vessels and coast guards.

Strategic Maritime Location

The South China Sea is a vital sea lane connecting the Pacific Ocean with the Indian Ocean. A significant portion of global trade and energy supplies passes through this route every year. Control over these waters enhances a country’s ability to influence international shipping, protect maritime trade, and project naval power across the Indo-Pacific. This strategic location is central to understanding the South China Sea Dispute.

Great-Power Competition

The South China Sea Dispute has increasingly become a focal point of strategic rivalry between China and the United States. China seeks to consolidate its influence by expanding its maritime presence and strengthening control over disputed areas. In contrast, the United States supports freedom of navigation, opposes excessive maritime claims, and maintains a regular naval presence in the region. This strategic competition has further complicated the dispute and increased the risk of military confrontation.

Thus, the South China Sea Dispute is not merely a territorial disagreement but a complex interaction of history, international law, economic interests, maritime security, and geopolitical competition, making it one of the most strategically significant issues in the Indo-Pacific.

5. International Law and the South China Sea Dispute

International law forms the legal foundation for resolving the South China Sea Dispute. The central issue is the conflict between This legal dimension has made the South China Sea Dispute a test case for the effectiveness China’s historical claims and the maritime rights established under the United Nations Convention on the Law of the Sea (UNCLOS). of the international rules-based order.

United Nations Convention on the Law of the Sea (UNCLOS)

The United Nations Convention on the Law of the Sea (UNCLOS), 1982, is regarded as the “Constitution of the Oceans.” It establishes the legal framework governing maritime boundaries, navigation, marine resources, and dispute settlement. Under South China Sea UNCLOS provisions:

• Every coastal state is entitled to a Territorial Sea extending up to 12 nautical miles from its baseline, over which it exercises full sovereignty.
• Every coastal state is also entitled to an Exclusive Economic Zone (EEZ) extending up to 200 nautical miles, within which it enjoys exclusive rights to explore and exploit natural resources.
• States also have rights over their continental shelf for exploring and exploiting seabed resources.
• At the same time, UNCLOS guarantees freedom of navigation and overflight in international waters, ensuring that commercial and military vessels can move without unlawful restrictions.

Most Southeast Asian claimant states base their maritime claims on these provisions. China is also a party to UNCLOS but argues that its historic rights in the South China Sea predate the Convention. Therefore, South China Sea UNCLOS remains central to understanding the South China Sea Issue.

2016 Permanent Court of Arbitration (PCA) Award

In 2013, the Philippines initiated arbitration proceedings against China under Annex VII of UNCLOS. On 12 July 2016, the Permanent Court of Arbitration (PCA), The Hague, delivered its landmark award. The Tribunal held that:

• China’s Nine-Dash Line has no legal basis under UNCLOS.
• China cannot claim historic rights over maritime areas beyond the limits permitted by UNCLOS.
• Several disputed features claimed by China are legally rocks or low-tide elevations, and therefore cannot generate a 200-nautical-mile EEZ.
• China had violated the Philippines’ sovereign rights within its EEZ by interfering with fishing and petroleum exploration activities.
• Large-scale land reclamation and construction of artificial islands had caused significant environmental damage to fragile marine ecosystems.

China rejected the award, declaring it “null and void” and refusing to recognise or implement the ruling. However, the decision remains a landmark legal precedent and is widely supported by many countries as an authoritative interpretation of UNCLOS.

Freedom of Navigation and Freedom of Navigation Operations (FONOPs)

The South China Sea Dispute involves one of the world’s busiest maritime trade routes, making freedom of navigation a matter of global concern. The United States and several other countries regularly conduct Freedom of Navigation Operations (FONOPs) to challenge what they consider excessive maritime claims and to reaffirm navigation rights guaranteed under international law.

China, however, views many of these operations as infringements on its sovereignty and argues that foreign military activities near its claimed territories threaten its national security. This difference in interpretation has resulted in frequent encounters between Chinese and foreign naval vessels, increasing the risk of miscalculation and accidental conflict.

The legal dimension of the South China Sea Dispute therefore extends beyond territorial claims. It represents a broader contest between historical claims and treaty-based international law, making it a critical issue for the future of the rules-based international maritime order.

6. Recent Developments in the South China Sea Dispute

Frequent China–Philippines Maritime Confrontations

• The Philippines and China have witnessed repeated confrontations around Second Thomas Shoal (Ayungin Shoal) and Scarborough Shoal.
• Chinese Coast Guard and maritime militia vessels have attempted to block or obstruct Philippine resupply missions.
• These incidents have increased diplomatic tensions and raised concerns over the possibility of accidental military escalation.
• The Philippines has strengthened maritime patrols and expanded defence cooperation with its allies.

Continued Militarisation by China

• China has continued to strengthen military infrastructure on several artificial islands in the Spratly and Paracel Islands.
• These installations include airstrips, ports, radar systems, missile facilities, and military bases.
• China maintains that these activities are for defensive purposes, while many countries view them as attempts to strengthen effective control over disputed areas.

Freedom of Navigation Operations (FONOPs)

• The United States has continued regular Freedom of Navigation Operations (FONOPs) in the South China Sea to challenge excessive maritime claims.
• Allied countries such as Australia, Japan, the United Kingdom, France, and Canada have also increased naval deployments and joint exercises in the region.
• These operations seek to uphold the principles of freedom of navigation and the rules-based international maritime order.

ASEAN–China Code of Conduct (COC) Negotiations

• ASEAN and China have continued negotiations on a legally binding Code of Conduct (COC) for the South China Sea.
• The objective is to establish rules for managing disputes, preventing incidents at sea, and promoting regional stability.
• Although progress has been made, differences over the scope, legal status, and implementation of the agreement continue to delay its finalisation.

Growing Strategic Competition

• The South China Sea Dispute has become a major theatre of U.S.–China strategic competition.
• China has increased its naval and coast guard presence, while the United States has expanded military cooperation with regional allies.
• The dispute has also attracted greater involvement from countries such as India, Japan, Australia, and European partners, reflecting the increasing geopolitical importance of the Indo-Pacific.

Current Situation (2026)

• Maritime confrontations continue without escalating into full-scale armed conflict.
• China maintains its expansive claims based on the Nine-Dash Line, while other claimant states continue to assert their rights under UNCLOS.
• The 2016 Permanent Court of Arbitration (PCA) Award remains an important legal reference, although China continues to reject it.
• Diplomatic engagement through ASEAN continues alongside increasing military preparedness by claimant states and major powers.
• The South China Sea Dispute remains one of the most significant flashpoints in the Indo-Pacific, with implications for regional security, international law, and global maritime trade.

7. Role of Major Stakeholders

China

China is the principal claimant in the South China Sea Dispute, asserting sovereignty over nearly 90% of the sea through its Nine-Dash Line. It argues that its claims are based on historical rights and has strengthened its presence by constructing artificial islands, developing military infrastructure, and increasing coast guard and naval patrols. China opposes internationalisation of the South China Sea Issue and prefers bilateral negotiations with individual claimant states.

ASEAN

Several ASEAN members, including Vietnam, the Philippines, Malaysia, and Brunei, are directly involved in the South China Sea Dispute. ASEAN advocates the peaceful settlement of disputes, respect for UNCLOS, and the early conclusion of a legally binding Code of Conduct (COC) with China. However, differing national interests among ASEAN members have often limited the organisation’s ability to adopt a unified approach.

United States

Although the United States is not a claimant, it has substantial strategic interests in maintaining a free and open Indo-Pacific. Washington opposes excessive maritime claims, supports freedom of navigation and overflight, and regularly conducts Freedom of Navigation Operations (FONOPs) in the South China Sea. The U.S. has also strengthened defence cooperation with allies and partners, particularly the Philippines, to preserve regional stability and uphold the rules-based international order.

Japan

Japan depends heavily on the South China Sea for its trade and energy imports. It supports the peaceful resolution of disputes based on UNCLOS and has expanded maritime security cooperation with Southeast Asian countries. Japan also provides capacity-building assistance, patrol vessels, and maritime surveillance support to countries such as the Philippines and Vietnam.

Australia

Australia advocates freedom of navigation, respect for international law, and peaceful dispute resolution. It regularly participates in joint naval exercises with the United States and other Indo-Pacific partners and supports ASEAN’s central role in maintaining regional stability.

QUAD (Quadrilateral Security Dialogue)

The QUAD, comprising India, the United States, Japan, and Australia, supports a free, open, inclusive, and rules-based Indo-Pacific. Although it does not directly intervene in territorial disputes, the QUAD consistently emphasises freedom of navigation, peaceful resolution of disputes, respect for international law, and adherence to UNCLOS. Through joint naval exercises such as Exercise Malabar and enhanced maritime cooperation, the QUAD contributes to regional security and stability.

The involvement of these stakeholders has transformed the South China Sea Dispute from a regional territorial disagreement into a major issue of global geopolitics, where maritime security, international law, and strategic competition increasingly intersect.

8. India’s Position on the South China Sea Dispute

India is not a claimant in the South China Sea Dispute. However, the region is of immense strategic importance to India because of its impact on maritime trade, energy security, the Indo-Pacific, and regional stability. Accordingly, India’s position on the South China Sea Dispute has adopted a balanced approach based on international law, strategic autonomy, and a rules-based maritime order.

India’s Core Position

India does not support the territorial claims of any particular country. Instead, it advocates the peaceful resolution of disputes through dialogue and diplomacy, without the use or threat of force. India believes that disputes should be resolved in accordance with international law, ensuring peace and stability in the Indo-Pacific region.

Support for UNCLOS and the Rules-Based Order

India consistently emphasises that the United Nations Convention on the Law of the Sea (UNCLOS), 1982 is the legal framework governing maritime rights and obligations. It supports respect for territorial integrity, sovereign rights, and maritime entitlements as provided under UNCLOS. India has repeatedly called upon all parties to comply with international law and avoid unilateral actions that could escalate tensions. This position makes South China Sea UNCLOS an important aspect of South China Sea and India relations.

Freedom of Navigation and Overflight

India strongly supports the principles of freedom of navigation and overflight, as uninterrupted maritime movement is essential for global commerce and regional security. Since a substantial portion of India’s trade with East Asia, Japan, South Korea, and the Pacific region passes through the South China Sea, ensuring open and secure sea lanes is a vital national interest.

Act East Policy

The South China Sea is central to India’s Act East Policy, which seeks to strengthen political, economic, and strategic engagement with Southeast Asia. Stable maritime conditions in the region facilitate trade, investment, connectivity, and cooperation with ASEAN, which is one of India’s key strategic partners. Therefore, the South China Sea Dispute has direct relevance to India’s Act East Policy.

SAGAR and Indo-Pacific Oceans Initiative (IPOI)

India’s vision of SAGAR (Security and Growth for All in the Region) and the Indo-Pacific Oceans Initiative (IPOI) promotes maritime security, sustainable use of marine resources, disaster management, and regional cooperation. These initiatives underscore India’s commitment to a free, open, inclusive, and rules-based Indo-Pacific, where disputes are resolved peacefully and maritime commons remain accessible to all.

Role in the QUAD

As a member of the Quadrilateral Security Dialogue (QUAD), India cooperates with the United States, Japan, and Australia to promote maritime security, freedom of navigation, humanitarian assistance, disaster relief, and adherence to international law. While the QUAD is not directed against any specific country, it supports a stable Indo-Pacific based on respect for sovereignty and peaceful dispute resolution.

Energy and Economic Interests

India’s state-owned company ONGC Videsh Limited (OVL) has participated in offshore oil and gas exploration projects in partnership with Vietnam in the South China Sea. Although China has objected to such activities, India maintains that these projects are commercial in nature and are carried out in accordance with international law. The South China Sea is also an important route for India’s trade and energy imports from East Asia, making stability in the region essential for India’s economic interests. This makes South China Sea and India an important area of strategic and economic consideration.

Strategic Significance for India

The South China Sea Dispute directly influences India’s maritime security, regional connectivity, and Indo-Pacific strategy. Escalation of the dispute could disrupt international trade, affect supply chains, increase strategic competition, and undermine regional stability. Therefore, India continues to advocate dialogue, respect for UNCLOS, ASEAN centrality, freedom of navigation, and peaceful settlement of disputes, while maintaining strategic autonomy and constructive engagement with all stakeholders.

India’s approach reflects its broader vision of a free, open, inclusive, peaceful, and rules-based Indo-Pacific, where international law rather than unilateral actions governs maritime affairs.

9. Global Implications of the South China Sea Dispute

Global Trade and Supply Chains

The South China Sea Dispute has major implications for global trade and supply chains. The South China Sea is one of the world’s busiest maritime trade routes, carrying nearly one-third of global maritime trade. Any disruption due to military confrontation or heightened tensions can interrupt global supply chains, increase shipping costs, delay the movement of goods, and adversely affect the world economy.

Maritime Security

The South China Sea Dispute has led to increasing militarisation of the region through the deployment of naval forces, coast guards, and military infrastructure. Frequent encounters between naval vessels and aircraft increase the risk of accidents and unintended military escalation, posing a challenge to maritime security in the Indo-Pacific.

U.S.–China Strategic Rivalry

The South China Sea Dispute has become a major arena of strategic competition between China and the United States. While China seeks to strengthen its control over disputed waters, the United States supports freedom of navigation and a rules-based maritime order. This rivalry has transformed the dispute into an issue with global strategic implications rather than merely a regional territorial conflict.

International Law and Rules-Based Order

The dispute has become a critical test for the effectiveness of UNCLOS and the broader rules-based international order. The rejection of the 2016 Permanent Court of Arbitration (PCA) Award by China has raised important questions regarding compliance with international legal decisions and the peaceful settlement of maritime disputes. Therefore, South China Sea UNCLOS remains an important dimension of the South China Sea Issue.

Blue Economy and Marine Environment

Large-scale land reclamation, construction of artificial islands, and intensive fishing activities have damaged coral reefs and marine ecosystems. These developments threaten biodiversity, fish stocks, and the sustainable use of ocean resources, thereby affecting the long-term prospects of the Blue Economy.

Indo-Pacific Stability

Continued tensions in the South China Sea Dispute have implications for the overall stability of the Indo-Pacific. They influence regional security partnerships, defence cooperation, and strategic alignments involving countries such as Japan, Australia, India, ASEAN members, and the United States. Maintaining peace in the South China Sea is therefore essential for ensuring a stable, open, and prosperous Indo-Pacific region.

Overall, the South China Sea Dispute extends far beyond competing territorial claims. It has emerged as a global issue affecting international trade, maritime security, international law, environmental sustainability, and the evolving balance of power in the Indo-Pacific.

10. Way Forward

• Resolve the South China Sea Dispute peacefully through sustained dialogue and negotiations in accordance with international law.
• Respect and implement UNCLOS (1982) as the primary legal framework governing maritime rights and obligations.
• Accelerate the conclusion of an effective and legally binding ASEAN–China Code of Conduct (COC) to prevent incidents and build mutual confidence.
• Avoid militarisation and unilateral actions, including the construction of new military infrastructure and the use of coercive measures in disputed areas.
• Ensure freedom of navigation and overflight to safeguard international trade, energy security, and global maritime commerce.
• Strengthen confidence-building measures, including maritime communication mechanisms, joint patrols, and crisis-management arrangements to prevent accidental conflicts.
• Promote joint exploration and sustainable utilisation of marine resources, including fisheries and hydrocarbons, without prejudicing the sovereignty claims of the parties.
• Enhance regional and multilateral cooperation through ASEAN-led mechanisms and support a free, open, inclusive, and rules-based Indo-Pacific based on respect for sovereignty and international law.

11. Conclusion

The South China Sea Dispute is far more than a territorial disagreement over islands and maritime boundaries; it is a complex geopolitical issue involving strategic competition, international law, maritime security, and economic interests. The South China Sea Dispute has emerged as a key test of the rules-based international order, particularly the implementation of UNCLOS and the peaceful settlement of disputes. Continued tensions not only threaten regional stability but also have far-reaching implications for global trade, energy security, and the Indo-Pacific balance of power.

Therefore, a durable solution requires respect for international law, sustained diplomatic engagement, restraint by all parties, and strengthened regional cooperation. For India, preserving a free, open, inclusive, and rules-based Indo-Pacific remains essential to safeguarding its maritime interests, economic growth, and long-term strategic objectives.

BPSC Mains Practice Questions

Q1. Why has the South China Sea Dispute emerged as one of the most contested maritime regions in the world? Discuss the major causes of the South China Sea Dispute.

Q2. Examine the significance of the South China Sea Dispute in the context of international law and Indo-Pacific geopolitics. Also discuss South China Sea and India and India’s position and strategic interests in the region.

Learn More

For authoritative information on the South China Sea Dispute, maritime rights, and South China Sea UNCLOS, readers can refer to the official United Nations resources on the United Nations Convention on the Law of the Sea (UNCLOS).