Sukhoi Su-33 related to T-10K. Negotiations stagnated as the Shenyang Aircraft company sought to reduce Russian content in the aircraft, while Sukhoi wanted to ensure a level of income from future upgrades and modifications made to the J-11. India was also viewed as another potential operator of the Su-33. The Indian Navy planned to acquire the Su-33 for its aircraft carrier, , the refurbished Soviet , which was sold to India in 2004. In the end, the rival MiG-29K was opted for, because of the Su-33's outdated avionics. The size of the Su-33 reportedly led to concerns over potential difficulties in operating
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