Countries Using P-63s
France (P-63C: 114) , Soviet Union (P-63A: 1,386, total: 2,376), United Kingdom and the United States used the P-63. However, the United States never used it in combat, only as a trainer or a target aircraft.
The US Army Air Force decided it wasn't advanced enough and around 2,400 / 2,421 P-63s were shipped to Russia. Around 300 went to the Free French forces. One was sent to the RAF.
There were some reports by United Nations' pilots that they encountered P-63s flown by North Koreans. They were code named "Fred" by NATO.
The French Armée de l'Air flew 5 squadrons of P-63C Kingcobras in Indo China.