After years of threatening to abandon the Philippines’ military alliance with the United States, President Rodrigo Duterte last week confirmed plans to terminate the agreement governing the presence of American troops, a key part of one of Southeast Asia’s major security partnerships. More distant relations between Washington and Manila could also lead to a recalculation by other countries in Southeast Asia, especially those whose South China Sea claims overlap with Beijing’s. Collin Koh, research fellow at RSIS, said Indonesia and Vietnam could seek closer military cooperation with the US.