Mig-21 came after 1965 war not before 1962 war .
You are right and I am right.
Wiki-
"Development of what would become the MiG-21 began in the early 1950s, when Mikoyan OKB finished a preliminary design study for a prototype designated Ye-1 in 1954. ..... It made its maiden flight on 16 June 1955 and its first public appearance during the Soviet Aviation Day display at Moscow's Tushino airfield in July 1956.
" India is the largest operator of MiG-21s. In 1961, the
Indian Air Force (IAF) opted to purchase the MiG-21 over several other Western competitors. As part of the deal, the Soviet Union offered India full transfer of technology and rights for local assembly.
[9] In 1964, the MiG-21 became the first supersonic fighter jet to enter service with the IAF. Due to limited induction numbers and lack of pilot training, the IAF MiG-21 played a limited role in the
Indo-Pakistani War of 1965.
[10] However, the IAF gained valuable experience while operating the MiG-21 for defensive sorties during the war."
Now sir, you are right that MIG 21 first saw operational Service with IAF in 1965. But I am right that USSR had agreed to give their latest MIG -21 to India in 1961 ... that indeed alarmed China and it is recorded in many histories of Sino- Indian conflict... I never said they were used in the 1962 War..