This is an interesting story. The P39 Airacobra was not used much by the U. S. Army Air Force as an interceptor during WWII due to the lack of a supercharger for its engine. This limited its speed and thus its usefulness about 17,000 feet. As a result many were shipped to the Soviets who were desperate for any type of plane. The Red Air Force found a good use for it as a ground attack fighter especially with its 37mm cannon.
The plane in this story was one of the Lend-Lease P39's sent to Russia. It was found intact in a lake in Siberia and was eventually brought back to a museum in Buffalo, New York.