South China Sea drills and cyanide claim
The U.S. and Australia joined the Philippines for a second joint maritime exercise in the South China Sea this year, signaling continued multi‑national patrol activity. Separately, Philippine officials reported lab confirmation of cyanide in bottles seized near Second Thomas Shoal and called it possible sabotage around a contested outpost. (reuters.com) (interaksyon.philstar.com)
The Philippines, the United States, and Australia have just finished another four-day joint patrol in the South China Sea as Manila separately says seized bottles near Second Thomas Shoal tested positive for cyanide. (afp.mil.ph) (interaksyon.philstar.com) The Armed Forces of the Philippines said the April 9 to 12 exercise was the 16th multilateral maritime cooperative activity in the West Philippine Sea and the second such drill in 2026 involving all three countries. The activity brought together warships, fighter aircraft, and surveillance planes inside the Philippine exclusive economic zone. (pna.gov.ph) (pacom.mil) Philippine officials said laboratory tests confirmed cyanide in yellow bottles recovered by the navy from Chinese sampans operating near the BRP Sierra Madre at Ayungin Shoal, also known as Second Thomas Shoal, during operations last year. National Security Council Assistant Director General Jonathan Malaya said the chemical could damage the reef and threaten Filipino troops stationed on the grounded ship. (interaksyon.philstar.com) (pna.gov.ph) Second Thomas Shoal has become one of the South China Sea’s most volatile flashpoints because the Philippines keeps a small military detachment aboard the BRP Sierra Madre, a navy ship it deliberately grounded there in 1999. China claims the shoal, calls the outpost illegal, and has repeatedly tried to block Philippine resupply missions. (amti.csis.org) (pacom.mil) The patrol and the cyanide finding landed days after the Philippines opened a new coast guard district base on Thitu Island, another Philippine-held feature in the Spratly chain. President Ferdinand Marcos Jr. has expanded security cooperation with Washington and Canberra as confrontations with Chinese coast guard and maritime militia vessels have intensified. (apnews.com) (reuters.com) An international tribunal in The Hague ruled in July 2016 that China’s sweeping claims in the South China Sea had no legal basis under the United Nations Convention on the Law of the Sea. Beijing rejected the award and continues to assert control over most of the waterway, including areas inside the Philippines’ exclusive economic zone. (docs.pca-cpa.org) (uscc.gov) China rejected the cyanide allegation on April 13, with embassy spokesperson Guo Jiakun calling it a “stunt” in reports carried by Philippine media. Beijing has also criticized past joint drills by the Philippines and its allies as actions that raise tension in the disputed sea. (msn.com) (abc.net.au) For now, Manila is pairing more allied patrols with a new accusation centered on the same shoal where its rusting outpost has anchored the dispute for more than a quarter century. (afp.mil.ph) (amti.csis.org)
