President Ferdinand Marcos Jr. said on Monday the presence of a Russian attack submarine in the Philippines' exclusive economic zone (EEZ) in the South China Sea was "very worrisome". A Russian Kilo-class submarine was sighted 80 nautical miles off the western province of Occidental Mindoro on Nov.

President Ferdinand Marcos expressed concern on Monday over reports of a Russian submarine sighted in the West Philippine Sea (WPS), describing any

China and Russia declared a "no limits" partnership when President Vladimir Putin visited Beijing in 2022, just days before Russia's invasion of Ukraine. The two countries carried out live-fire naval exercises in the South China Sea in July.

A Russian attack submarine was recently spotted in Philippine waters in a development which President Ferdinand Marcos Jr. said was “worrisome.”