1in April, 960, after the talks between the Chinese and Indian prime ministers broke down, the Soviet Union provided India with a large amount of military equipment (according to Howard Benjamin, a former official of the American Far East Intelligence Center in India, "the Indian government accepted a full set of Soviet-made weapons assistance at that time." Helicopters and transport planes used by the Indian Army in the Himalayan Plateau can adapt to flying at an altitude of16,000 feet, which was newly produced by the Soviet Union at that time and provided to India. Including pilots of the Indian army, were trained by the Soviet army.
India also negotiated with the Soviet Union to purchase the most advanced MIG -2 1 fighter. The Soviet Union explicitly refused to provide it to China before, but a few months before the Sino-Indian War broke out, the Soviet Union handed it to India together with the design drawings of the aircraft. The Soviet Union also assured India that it could provide a complete set of equipment when India produced and manufactured such aircraft in the future.
Then, with the gradual breakdown of the relationship between the Soviet Union and China at that time, it gradually changed from favoring India to directly supporting India on the Sino-Indian border issue.