News Analysis China’s main adversary in South Asia is India. Beijing is focused like a laser beam on reducing New Delhi’s influence in the region. The two countries have fought several recent military skirmishes and also a border war in 1962 over disputed territory in the Himalayan Mountains and the Seven Sister States of northeast India (Arunachal Pradesh, Assam, Meghalaya, Manipur, Mizoram, Nagaland, and Tripura). An area unknown to most of the world is the Siliguri Corridor, nicknamed the “Chicken’s Neck,” that strategically connects the isolated Seven Sister States to the rest of India via the only rail service in the area. Sikkim joined the rest of India as a state in 1975, having been quasi-independent until then. The Seven Sister States are bordered on three-and-a-half sides by Bangladesh, Burma (Myanmar), China, Bhutan, and Nepal—the latter two being effectively controlled by China. On China’s side of the border, China’s Chumbi Valley is …