An RAF B-47 aircraft (RB-47E), modified for reconnaissance (upon American request), flying over the Kola Peninsula and airfields east of Leningrad, was flanked and repeatedly hit by MiG-17s. The aircraft managed to return to base, but from now on Washington banned low-altitude missions over Soviet soil. This laid the foundations for the U-2 (high-altitude flight) and CORONA spy satellite programs.
