Sukhoi No. 135 in Kharkiv, Ukraine. However, Sukhoi was not satisfied with its location, since it was isolated from the scientific pole of Moscow. Sukhoi later relocated the bureau to the aerodrome of Podmoskovye in Moscow, completing half of the relocation by 1940. Sukhoi encountered another issue: the bureau had no production line in Moscow, thus making it useless as Sukhoi had nothing to do. During the German invasion of the Soviet Union in World War II, the Su-2 needed a successor as it was proved obsolete and under-armed against German aircraft, with 222 aircraft destroyed in total. Sukhoi and his
Sukhoi-Gulfstream S-21 Sukhoi-Gulfstream S-21 Sukhoi-Gulfstream S-21 was a projected Russian-American supersonic business jet. In the early 1990s, Gulfstream Aerospace and the Sukhoi Design Bureau began a joint effort to develop a supersonic small business jet, code named the S-21. Due to questionable market demand for commercial supersonic air travel, commitment to the project weakened and delays mounted. Gulfstream eventually dissolved the partnership, although Sukhoi continued work on the S-21. The S-21 would be capable of sustained cruise at Mach 2+ and much research and development has gone into the management of the troublesome transonic effects phenomena associated with near Mach 1 air