South China Sea tensions escalate as ASEAN pushes stalled code of conduct
The South China Sea remains a flashpoint between China and several Southeast Asian nations, particularly the Philippines, as diplomatic negotiations stall and military tensions rise. ASEAN has been working on a binding Code of Conduct with China since 2002, with the Philippines now leading these efforts as 2026 ASEAN chair. However, recent satellite imagery shows China has deployed ships and a floating barrier blocking the entrance to Scarborough Shoal, a disputed fishing ground claimed by the Philippines within its exclusive economic zone. Additionally, the Philippines claims to have found cyanide on Chinese vessels near disputed reefs, raising fresh alarm about potential sabotage. China rejects these allegations and maintains its historical claims over most of the South China Sea, defying a 2016 international tribunal ruling that rejected its position. More than three trillion dollars in global trade passes through these waters annually, making even localized tensions matters of international concern. Negotiations on a legally binding Code of Conduct remain fraught due to disagreements over enforcement, scope, and whether external powers should participate in joint military exercises.
Key facts
- China deployed a 352-meter floating barrier at Scarborough Shoal entrance in April 2026, restricting Philippine fishing access within their exclusive economic zone
- Philippines claims cyanide was found on Chinese vessels near Second Thomas Shoal in April 2026, alleging potential sabotage of marine ecosystems
- 2016 Permanent Court of Arbitration ruling found China's nine-dash line claim has no legal basis under international law; China rejects this decision
- ASEAN-China Code of Conduct negotiations have achieved roughly 70 percent agreement but remain stalled on geographic scope, legal binding nature, and external power involvement
- More than 3 trillion dollars in global trade annually passes through South China Sea waters
- Chinese Coast Guard doubled presence at Scarborough Shoal and nearly tripled patrols around Sabina Shoal in 2025
- Philippines and United States conducting over 500 military exercises in 2026, with Japan joining Balikatan exercises as full participant for first time
- China constructing large airbase on Antelope Reef in Paracel Islands, covering approximately 1,500 acres of reclaimed land
How different outlets framed it
Left-leaning coverage: Left-leaning outlets stress China's aggressive militarization, coercive gray-zone tactics, and the potential threats to international law and freedom of navigation. They emphasize that China's island-building, water cannon attacks, and barriers violate established legal norms and endanger regional stability, while highlighting the Philippines' reliance on international law and the 2016 tribunal ruling as legitimate grounds for its claims.
Right-leaning coverage: Right-leaning outlets stress the need for robust U.S. and allied military presence to counter Chinese assertiveness and support the Philippines. They view China's actions as deliberate expansionism that could disrupt global trade and threaten Taiwan. They advocate for increased joint military exercises and deterrence rather than accommodation.
Limits of this briefing
Most recent coverage focuses on Philippine and Western perspectives; Chinese state media perspectives are limited in available English-language sources. The cyanide allegation remains contested, with China dismissing it as a Philippine fabrication. Long-term implications of recent military buildups and their effect on code of conduct negotiations remain uncertain.
Sources
- Foundation for Defense of Democracies: China Restricts Access and Expands Reach in the South China Sea Right
- East Asia Forum: ASEAN's Incremental Diplomacy in the South China Sea Centre
- Chatham House: With the Philippines as ASEAN Chair, South China Sea Agreement Unlikely Centre
- Al Jazeera: Philippines Accuses China of Using Cyanide to Poison South China Sea Atoll Centre
- South China Morning Post: South China Sea Expert Warns 2026 Code of Conduct Simply Not Achievable Centre