It was not only India and China that engaged with their shared frontier prior to 1962. Although far from their main concern, English-speaking Western countries analyzed developments in that region and at times offered support to India, Tibetans, the Himalayan kingdoms, and Burma. The West's historical relations with political entities along the Sino-Indian frontier informed Cold War policies. The United Kingdom's relations with Tibet date back to the eighteenth century when British officials viewed it as both a curiosity and a potential trading partner. These views evolved during the nineteenth century as Britain came to regard Tibet as an important pawn in the Great Game. Britain specifically promoted Tibetan suzerainty to establish it as a buffer zone, as first exemplified by the 1907 Anglo-Russian Treaty. International relations scholar Dibyesh Anand argues that Britain used the ambiguous terms “Chinese suzerainty” and “Tibetan autonomy” to “deal with Tibet as a de facto independent buffer state without having to offend China and other Western powers.” By the mid-1940s, this need evaporated and Britain in practice recognized Chinese sovereignty over Tibet—thereby revealing its desire to strengthen Sino-British relations.

Britain's interest in Nepal stemmed from its enlistment of Gurkhas (i.e., Nepalese soldiers for hire), who served throughout the British Empire since the nineteenth century.