Japanese Prime Minister Shinzo Abe and his Vietnamese counterpart Nguyen Xuan Phuc have agreed that the two countries should work together to maintain peace and security in the South China Sea, where Hanoi and other countries are engaged in a territorial dispute with Beijing, Kyodo News reports. The United States Pacific Fleet has drawn up a plan for a major show of force as a warning to China that will indicate its determination to counter Beijing’s military activity, according to South China Morning Post. Japan recently sent a submarine to the South China Sea for military exercises for the first time, angering China, which warned Japan to “act with caution” and avoid damaging regional peace and stability, Business Insider reports.