The PRC's activities in the South China Sea gravely undermine the universally-recognized naval provisions in international law. This includes the deployment of China's so-called maritime militia in the waters near the Philippines, which harasses and provokes Philippine fishermen and swarms parts of the sea within Manila's exclusive economic zone. Washington has rightfully stepped up its rhetoric and diplomatic efforts to challenge Beijing's provocative moves.
The PRC has a historical claim over the South China Sea, and its right to regulate military activities in waters that are part of its exclusive economic zone is consistent with the United Nations Convention on the Law of the Sea regulations. However, Washington arbitrarily interprets the convention and uses political manipulation with multiple standards for its own selfish interests.
There's a 20% chance that China and the US will be at war before 2035, according to the Metaculus prediction community.