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🏓History of Modern China

Key Issues in the South China Sea Territorial Disputes

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Why This Matters

The South China Sea disputes are far more than a regional squabble over rocks and reefs—they represent one of the most significant tests of international law, sovereignty, and great power competition in the 21st century. When you study these conflicts, you're examining how modern China balances its historical narratives with its rise as a global power, and how smaller nations navigate between asserting their rights and managing relationships with a dominant neighbor. These disputes touch on core themes you'll encounter throughout your study of modern China: the tension between historical claims and international norms, the role of nationalism in foreign policy, and the strategic importance of resource competition in shaping state behavior.

You're being tested on your ability to connect specific territorial disputes to broader patterns in Chinese foreign policy and international relations. Don't just memorize which country claims which island—understand why these claims matter, how they reflect China's strategic priorities, and what legal and diplomatic frameworks shape the conflict. The disputes illustrate concepts like sovereignty assertion, economic nationalism, and multilateral versus bilateral diplomacy. When you can explain why China prefers bilateral negotiations while ASEAN pushes for multilateral solutions, you're demonstrating the analytical thinking that earns top marks.


Historical Claims and Sovereignty Narratives

China's approach to the South China Sea is rooted in historical narratives that predate modern international law. Understanding how states use history to legitimize territorial claims reveals the intersection of nationalism and foreign policy.

Nine-Dash Line Claim by China

  • Encompasses roughly 90% of the South China Sea—a vast area marked by nine dashes on Chinese maps since 1947, originally drawn by the Republic of China
  • Overlaps with claims from six other nations (Vietnam, Philippines, Malaysia, Brunei, Indonesia, and Taiwan), creating a web of competing sovereignty assertions
  • Lacks clear legal definition under international law—China has never specified whether the line represents a territorial boundary, historic waters, or resource rights, creating deliberate ambiguity

Paracel Islands Dispute

  • Controlled by China since 1974 following a naval battle with South Vietnam, making it the earliest major territorial seizure in the modern dispute
  • Claimed by Vietnam and Taiwan based on historical administration and geographic proximity, with Vietnam citing French colonial-era control
  • Strategic location near major shipping lanes gives whoever controls the islands leverage over regional maritime traffic and fishing grounds

Compare: Nine-dash line vs. Paracel Islands—both rest on historical claims, but the Paracels involve physical control while the nine-dash line represents aspirational boundaries. If an FRQ asks about China's use of history in territorial disputes, note how China employs both symbolic claims and military occupation.


Resource Competition and Economic Stakes

The South China Sea contains some of the world's richest fishing grounds and potentially massive hydrocarbon reserves. Competition for resources drives much of the urgency behind these disputes, connecting territorial claims to economic nationalism.

Spratly Islands Dispute

  • Claimed by six parties (China, Vietnam, Philippines, Malaysia, Brunei, and Taiwan)—the most multilateral of all South China Sea disputes
  • Estimated 11 billion barrels of oil and 190 trillion cubic feet of natural gas lie beneath the seabed, though exact figures remain contested
  • China occupies seven features and has transformed reefs into artificial islands, fundamentally changing the physical geography of the area

Reed Bank Dispute

  • Located within the Philippines' 200-nautical-mile EEZ—making it a test case for whether international law or Chinese claims prevail
  • Contains significant natural gas deposits that the Philippines has sought to develop, only to face Chinese interference
  • Site of repeated confrontations between Chinese maritime militia and Filipino vessels, illustrating gray zone tactics that fall short of military conflict

Scarborough Shoal Dispute

  • Traditional fishing ground for Filipino fishermen until China established de facto control following a 2012 standoff
  • Located only 120 miles from the Philippine coast but over 500 miles from mainland China, highlighting the geographic stretch of Chinese claims
  • Potential site for future island-building that would give China a strategic foothold closer to the Philippine mainland

Compare: Spratly Islands vs. Reed Bank—both involve resource competition, but the Spratlys feature multiple claimants and physical occupation while Reed Bank represents a bilateral dispute over EEZ rights. Reed Bank is your clearest example of UNCLOS provisions being tested.


The South China Sea disputes have become a battleground for competing interpretations of international maritime law. Whether rules-based order can constrain great power behavior is the central question these conflicts pose.

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

  • Establishes 200-nautical-mile Exclusive Economic Zones (EEZs) where coastal states have sovereign rights over resources—the legal foundation for most Southeast Asian claims
  • Ratified by China in 1996, yet Beijing argues that UNCLOS doesn't supersede historical rights, creating a fundamental interpretive conflict
  • Distinguishes between islands and rocks—only islands capable of sustaining human habitation generate full EEZ rights, a distinction critical to the Spratly disputes

2016 Philippines v. China Arbitration Case

  • Ruled decisively against China's nine-dash line, finding no legal basis for historic rights claims that exceed UNCLOS provisions
  • Classified key Spratly features as rocks or low-tide elevations, meaning they cannot generate EEZ claims—a devastating blow to China's legal position
  • China rejected the ruling as "null and void", refusing to participate in proceedings and setting a precedent for great power defiance of international tribunals

Compare: UNCLOS vs. 2016 Arbitration—UNCLOS provides the framework, while the arbitration case represents its application. The case demonstrates both the power and limitations of international law: it clarified legal rights but couldn't compel Chinese compliance.


Strategic Competition and Military Dimensions

The disputes have increasingly become a theater for great power competition, with military posturing and infrastructure development reshaping the regional security environment. How states project power and respond to perceived threats defines this dimension.

China's Island-Building and Militarization Efforts

  • Created over 3,200 acres of new land through dredging and reclamation in the Spratly Islands since 2013—transforming submerged reefs into military installations
  • Constructed airstrips, radar systems, and missile batteries capable of projecting power across the entire South China Sea
  • Justified as defensive measures by Beijing, but neighboring states and the U.S. view them as changing the status quo through fait accompli

Freedom of Navigation Operations by the United States

  • Challenges "excessive maritime claims" by sailing warships within 12 nautical miles of features China claims—asserting that international waters remain open
  • Increased in frequency under both Obama and Trump administrations, signaling sustained U.S. commitment to the region
  • Risks escalation through potential miscalculation, as Chinese and American vessels operate in close proximity with competing interpretations of acceptable conduct

Compare: China's island-building vs. U.S. FONOPs—both are assertions of presence and rights, but China builds permanent infrastructure while the U.S. conducts temporary operations. This contrast illustrates different strategies: China changes facts on the ground while the U.S. upholds legal norms through demonstration.


Diplomatic Mechanisms and Regional Responses

How Southeast Asian nations collectively and individually respond to Chinese pressure reveals the challenges of multilateral diplomacy when power asymmetries exist.

ASEAN's Role in Dispute Resolution Attempts

  • Promotes a Code of Conduct (COC) that would establish binding rules for behavior in the South China Sea—negotiations have continued since 2002
  • Operates by consensus, meaning China can effectively veto strong statements by cultivating allies like Cambodia within the organization
  • Represents the tension between unity and national interests—claimant states want stronger action while non-claimants prioritize economic ties with China

Compare: 2016 Arbitration vs. ASEAN diplomacy—the arbitration sought legal resolution through binding judgment, while ASEAN pursues political resolution through negotiation. China's rejection of the arbitration and preference for bilateral talks over ASEAN frameworks shows how powerful states can choose their preferred arena.


Quick Reference Table

ConceptBest Examples
Historical claims vs. international lawNine-dash line, 2016 Arbitration ruling
Resource competitionSpratly Islands, Reed Bank, Scarborough Shoal
Physical occupation and controlParacel Islands, China's artificial islands
UNCLOS and EEZ rightsReed Bank, 2016 Arbitration, UNCLOS framework
Great power competitionU.S. FONOPs, China's militarization
Multilateral diplomacy challengesASEAN Code of Conduct negotiations
Gray zone tacticsScarborough Shoal standoff, Reed Bank confrontations
Legal vs. political resolution2016 Arbitration vs. ASEAN diplomacy

Self-Check Questions

  1. Which two disputes best illustrate the conflict between China's historical claims and UNCLOS-based EEZ rights, and why do they demonstrate this tension differently?

  2. Compare China's approach to the Paracel Islands (1974) with its island-building in the Spratlys (2013-present). What do these strategies reveal about how China's methods of asserting sovereignty have evolved?

  3. If an FRQ asks you to evaluate the effectiveness of international law in resolving territorial disputes, which two examples from this guide would you contrast, and what would your argument be?

  4. Why does China prefer bilateral negotiations over ASEAN-led multilateral frameworks? Identify at least two specific advantages this approach provides Beijing.

  5. How do U.S. Freedom of Navigation Operations and China's island-building represent competing visions of regional order? What does each action signal about its respective country's strategic priorities?