Sukhoi T-60S Sukhoi in 1984 but was cancelled after the Cold War ended in the early 1990s. The bomber was to have replaced the Tu-22M in the Soviet Air Force. Instead, Sukhoi decided took a more conventional approach and developed the Su-34 as a replacement for the Tu-22M. Sukhoi T-60S The Sukhoi T-60S was a planned Soviet 1980s replacement for the Tu-22M3. The supersonic intermediate range bomber never got past the drawing board. Very little information is available about technical characteristics of this aircraft, which remains classified by the Sukhoi Design Bureau. It was believed that T-60S would have featured a variable
Sukhoi-Gulfstream S-21 speeds. As of 2012, the project had not received any funding for the 2013-2025 development period and appeared to be cancelled. 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