In 1962 China and India engaged in the brief Sino-Indian War over the border in the Himalayas. The war was a complete rout for the Indians and led to a refocusing on arms build-up and an improvement in relations with the United States. China withdrew from disputed territory in the contested Chinese South Tibet and Indian North-East Frontier Agency that it crossed during the war. India disputes China's sovereignty over the smaller Aksai Chin territory that it controls on the western part of the Sino-Indian border.