Tensions are rising between China and the Philippines over control of the South China Sea, which Beijing sees as its territory, and Manila as its exclusive economic zone. On GZERO World with Ian Bremmer, US Ambassador Nick Burns explained the US position that it is concerned about China’s aggression in the South China Sea, particularly at Second Thomas Shoal, a submerged reef where Manila deliberately beached a ship in 1999 and has used as a military outpost ever since.