If China took the BRP Sierra Madre, it could spark conflict, and the Philippines would expect US intervention. JAY DIRECTO/Getty ImagesThe Philippines would expect US intervention should China take the BRP Sierra Madre warship.The Sierra Madre is a grounded WWII vessel marking Philippine territory in the Second Thomas Shoal.Tensions between China and the Philippines are increasingly high in the contested South China Sea.As pressure builds in the South China Sea amid frequent clashes, the Philippines is drawing a line: should China take a rusted warship outpost marking Manila's territory, the Philippines would expect US intervention.Such a move could have significant repercussions, escalating the ongoing Chinese-Philippine dispute in the region into a crisis.In a new interview with CBS News 60 Minutes, Philippine Secretary of National Defense Gilberto Teodoro explained that there were ongoing discussions between the US and the Philippines about which scenarios amid tensions between Manila and Beijing would prompt America to get involved.One flash point, Teodoro said, would be if China took the BRP Sierra Madre, a grounded, rusted warship that marks sovereign Philippine territory.