麦克马洪线
The 1907 Anglo-Russian Treaty, which had earlier caused the British to question the validity of Simla, had been renounced by the Russians in 1917 and by the Russians and British jointly in 1921. Tibet, however, altered its position on the McMahon Line in the 1940s. In late 1947, the Tibetan government wrote a note presented to the newly independent Indian Ministry of External Affairs laying claims to Tibetan districts south of the McMahon Line. Furthermore, by refusing to sign the Simla documents, the Chinese Government had escaped according any recognition to the validity of the McMahon Line.