Firefox (1982)

Clint Eastwood is a top American fighter pilot called out of retirement and sent to the USSR to steal a new superfighter that can run rings around anything the US has, and whose weapon systems are thought controlled. Eastwood goes off to England for training and is eventually smuggled into the Soviet Union. Narrowly avoiding hordes of suspicious bureaucrats and KGB men, he steals the plane and flies it back home, with two similar fighters in hot pursuit.