The 1962 Sino-Indian War ended when China declared a unilateral ceasefire on November 21, 1962, and withdrew its troops to pre-war positions. There was no UN intervention - the UN Security Council did not pass any resolution on this conflict. The Soviet Union (Russia) did not intervene militarily. India did not sign any treaty with China to end the war. China's unilateral decision was driven by geopolitical factors including US pressure and logistical challenges of maintaining forces in the Himalayan winter.