Only five production aircraft had been completed before the entire program was canceled in early 1956 when the VVS discarded its close air-support doctrine in favor of tactical nuclear weapons on the battlefield.
Tapi hanya lima pesawat produksi telah selesai sebelum seluruh program dibatalkan pada tahun 1956-an ketika VVS dibuang doktrin dukungan udara dalam mendukung senjata nuklir taktis di medan perang.