中苏关系
Relations between the PRC and India deteriorated during the rest of the 1960s and the early 1970s while the China–Pakistan relations improved and Sino-Soviet relations worsened. The PRC backed Pakistan in its 1965 war with India, and issued "ultimatums" threatening military action at its own border. The threats only served to damage Pakistan's relations with the western powers. In late 1967, there were two more conflicts between Indian and Chinese forces at their contested border, in Sikkim, known as the Nathu La and Cho La clashes. Both sides suffered heavy casualties but India came out in a better position than PRC.