2015 Russian Sukhoi Su-24 shootdown 2015 Russian Sukhoi Su-24 shootdown A Turkish Air Force F-16 fighter jet shot down a Russian Sukhoi Su-24M attack aircraft near the Syria–Turkey border on 24 November 2015. According to Turkey, the aircraft—whose nationality was unknown at the time—was fired upon while in Turkish airspace because it violated the border up to a depth of for about 17 seconds after being warned to change its heading 10 times over a period of five minutes before entering the airspace. The Russia Defence Ministry denied the aircraft ever left Syrian airspace, counter-claiming that their satellite data showed that the Sukhoi was about
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