The naval forces of the United States, Japan, Australia and India have started a joint exercise, Pentagon press secretary John Kirby said Tuesday, in the face of China's maritime assertiveness in the region.The four nations, known as the "Quad," will hold the Malabar exercise until Thursday in the Bay of Bengal in the northeastern Indian Ocean, according to Japan Maritime Self-Defense Force.The exercise involves two Japanese escort vessels, the U.S. Navy's nuclear-powered aircraft carrier Carl Vinson, an Australian frigate and an Indian destroyer, the MSDF said.The Quad nations are working …READ FULL ARTICLE