“The South China Sea: A Crucible of Geopolitics, Resources, and International Law
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The South China Sea: A Crucible of Geopolitics, Resources, and International Law

The South China Sea (SCS), a semi-enclosed body of water in the Western Pacific Ocean, has become one of the most complex and contentious geopolitical flashpoints in the 21st century. Bordered by numerous countries, including China, Vietnam, the Philippines, Malaysia, Brunei, and Indonesia, the SCS is a vital conduit for global trade, a rich source of natural resources, and a region with overlapping territorial claims. The escalating tensions in the SCS stem from a combination of historical grievances, competing national interests, strategic competition between major powers, and differing interpretations of international law.
Historical Claims and Territorial Disputes
The root of the SCS dispute lies in the ambiguous and overlapping territorial claims asserted by various countries. China’s claim, based on its "nine-dash line," encompasses approximately 90% of the SCS, extending hundreds of miles south and east from its Hainan Island. This claim, first asserted in the 1940s, is based on historical records and maps that China argues demonstrate its long-standing sovereignty over the islands and waters within the line. However, the precise legal basis and scope of the nine-dash line remain unclear, and it has been widely criticized by other claimant states and international legal scholars for being inconsistent with the United Nations Convention on the Law of the Sea (UNCLOS).
Vietnam bases its claims on historical evidence and its assertion of continuous occupation and administration of the Paracel and Spratly Islands, which are located within the SCS. The Philippines asserts its rights based on proximity and UNCLOS, arguing that its exclusive economic zone (EEZ) extends into the SCS. Malaysia and Brunei also have claims based on their continental shelves and EEZs, as defined by UNCLOS.
The overlapping claims have led to numerous incidents and confrontations over the years, including naval standoffs, fishing disputes, and the seizure of vessels. The most prominent disputes revolve around the sovereignty over the Paracel and Spratly Islands, as well as the Scarborough Shoal. These islands, rocks, and reefs are strategically important due to their location along major shipping lanes and their potential to generate EEZs.
China’s Assertiveness and Island-Building Activities
In recent years, China has significantly increased its assertiveness in the SCS, leading to heightened tensions and concerns among other claimant states and the international community. China has undertaken extensive land reclamation activities, transforming submerged reefs and rocks into artificial islands. These artificial islands have been equipped with military facilities, including runways, radar systems, and missile batteries, raising concerns about the militarization of the SCS and China’s intent to exert greater control over the region.
China defends its activities as necessary for self-defense and to improve the living conditions of personnel stationed on the islands. However, its actions have been widely condemned by other countries, who view them as a violation of international law, a threat to freedom of navigation, and an attempt to unilaterally alter the status quo in the SCS.
The United Nations Convention on the Law of the Sea (UNCLOS)
UNCLOS, adopted in 1982, is a comprehensive international treaty that establishes the legal framework for the use of the world’s oceans and seas. It defines the rights and responsibilities of states with respect to maritime zones, including territorial seas, EEZs, and the continental shelf. UNCLOS also provides for the peaceful settlement of disputes through mechanisms such as arbitration and the International Tribunal for the Law of the Sea (ITLOS).
The SCS dispute is deeply intertwined with UNCLOS. While China is a party to UNCLOS, it has made declarations that limit the jurisdiction of dispute settlement mechanisms under the convention. In 2016, the Philippines brought a case against China before an arbitral tribunal under UNCLOS, challenging the validity of China’s nine-dash line and its activities in the SCS. The tribunal ruled in favor of the Philippines, finding that China’s claims within the nine-dash line had no legal basis and that China had violated the Philippines’ sovereign rights within its EEZ.
China rejected the tribunal’s ruling, stating that it did not recognize the tribunal’s jurisdiction and that the ruling was null and void. This has further complicated the SCS dispute and raised questions about the effectiveness of international law in resolving territorial disputes.
Strategic Competition and Great Power Rivalry
The SCS has become a focal point of strategic competition between major powers, particularly the United States and China. The United States, while not a claimant state, has a strong interest in maintaining freedom of navigation and upholding international law in the SCS. The U.S. conducts regular freedom of navigation operations (FONOPs) in the SCS, sending naval vessels and aircraft through the region to challenge what it considers to be excessive maritime claims and to demonstrate its commitment to freedom of navigation.
China views the U.S. presence in the SCS as an attempt to contain its rise and to interfere in its internal affairs. China has repeatedly protested the U.S. FONOPs, arguing that they undermine its sovereignty and security interests. The U.S. and China have also engaged in diplomatic and economic competition in the region, seeking to strengthen their alliances and partnerships with other countries.
Other countries, such as Japan, Australia, and India, also have strategic interests in the SCS and have expressed concerns about China’s assertiveness. These countries have increased their naval presence in the region and have conducted joint military exercises with the United States and other allies to enhance maritime security cooperation.
Economic Interests and Resource Competition
The SCS is a vital shipping lane, through which approximately one-third of global trade passes. Disruptions to navigation in the SCS could have significant economic consequences for countries around the world. The SCS is also believed to contain substantial reserves of oil and natural gas, although the exact amount is uncertain. The potential for resource exploitation has further fueled the competition among claimant states.
China has been actively exploring and developing oil and gas resources in the SCS, often in areas claimed by other countries. This has led to confrontations and tensions, particularly with Vietnam and the Philippines. The environmental impact of resource extraction in the SCS is also a concern, as it could damage fragile marine ecosystems and threaten the livelihoods of coastal communities.
Regional Diplomacy and Conflict Management
Despite the tensions and challenges, there have been efforts to manage the SCS dispute through regional diplomacy and cooperation. The Association of Southeast Asian Nations (ASEAN) has played a key role in promoting dialogue and seeking a peaceful resolution to the dispute. ASEAN and China have been working on a Code of Conduct (COC) for the SCS, which aims to establish rules and norms of behavior to prevent incidents and manage disputes. However, progress on the COC has been slow, and there are disagreements over its scope and enforceability.
Bilateral dialogues between claimant states have also been important in managing tensions and exploring potential areas of cooperation. However, these dialogues have often been hampered by mistrust and differing perspectives on the legal and historical basis of the claims.
Potential Scenarios and Future Outlook
The future of the SCS remains uncertain, and there are several potential scenarios that could unfold. One scenario is a continuation of the current situation, with ongoing tensions, occasional confrontations, and slow progress on regional diplomacy. Another scenario is an escalation of the conflict, potentially triggered by a miscalculation or an incident at sea. A third scenario is a breakthrough in negotiations, leading to a more stable and cooperative environment in the SCS.
The SCS dispute is a complex and multifaceted challenge that requires a comprehensive approach involving legal, diplomatic, and security measures. It is essential for all parties to exercise restraint, respect international law, and pursue peaceful means of resolving their disputes. The SCS is a vital region for global trade and security, and its stability is in the interest of all countries.
Conclusion
The South China Sea remains a critical juncture in international relations, characterized by competing territorial claims, strategic rivalry, and economic interests. The actions of China, particularly its island-building and military activities, have significantly raised the stakes. While international law, particularly UNCLOS, provides a framework for resolving disputes, its effectiveness is challenged by China’s rejection of unfavorable rulings. The role of external powers like the United States further complicates the situation, turning the SCS into a stage for great power competition. Moving forward, a commitment to diplomacy, adherence to international law, and a focus on cooperative solutions are essential to prevent escalation and ensure stability in this vital maritime region. The stakes are high, and the path forward requires careful navigation to avoid a crisis that could have far-reaching consequences.