The United States, Japan, Australia and India began their joint Malabar naval exercise in waters off the Kanto region surrounding Tokyo on Thursday amid China's growing assertiveness in the Indo-Pacific region.The four nations of the so-called Quad grouping aim to strengthen ties through the joint training, which runs through Nov. 12 and includes exercises involving responses to submarines and surface fleets, Japan's Maritime Self-Defense Force said."The security environment in the Indo-Pacific region is becoming increasingly complex," Vice Adm. Katsushi Omachi, commander of Japan's Self-De…READ FULL ARTICLE