South Tibet
Arunachal Pradesh, a state in the Northeastern tip of India, is claimed by China as South Tibet. Sino-Indian relations degraded, resulting in the Sino-Indian War of 1962. The cause of the escalation into war is still disputed by both Chinese and Indian sources. During the war in 1962, the PRC (China) captured much of the NEFA (North-East Frontier Agency) created by India in 1954. But on 21 November 1962, China declared a unilateral ceasefire, and withdrew its troops behind the McMahon Line. It returned Indian prisoners of war in 1963.