During this time, three new Russian fighters, the LaGG-1, the Yak-1, and the MiG-3 were just coming off of the production line. The Soviet Air Defense Force had been fraught with problems since World War I. The German Barbarossa offensive on June 22, 1941, destroyed more than 2000 Soviet aircraft on the first day, and more than 5000 before October. With great desperation, the Soviets fought in dogfights over Leningrad, Moscow, and the Ukraine for more than a year.