Sukhoi InterceptorsClosed in 1949, the Sukhoi Design Bureau was reborn in 1953 to meet an urgent demand for a fast interceptor that would counter the threat posed by NATO bombers. It wasted no time developing a succession of missile armed, Mach 2 interceptors characterized by delta wings; the single engined Su 9 entered service in 1960, followed by the up armed Su 11 in 1964 and the twin engined Su 15 in 1967. Though built in modest numbers, the three types became an