cargo ship, Progress MS-04, was lost on 1 December 2016 shortly after launch, likely due to a problem with the third stage of the Soyuz-U. In April 2015, Soyuz-U was declared obsolete. Its production was stopped and the rocket was scheduled for retirement after launching the remaining vehicles with Progress cargo ships. The final flight was Progress MS-05, which launched from the Baikonur Cosmodrome on 22 February 2017, 05:58:33 UTC. References External links (PDF) Soyuz Launch Vehicle Users Manual Astronautix.com entry on Soyuz-U / 11A511U Astronautix.com entry on Soyuz-U2 / 11A511U2 Russian Federal Space Agency about Soyuz-U Russian Federal Space Agency about Soyuz-U/Ikar Russian Federal Space Agency about Soyuz-U/Fregat Russian Federal Space Agency about Soyuz-U2 LV's manufacturer TsSKB-Progress about Soyuz-U (in Russian) 1973 in spaceflight Soyuz program Space launch vehicles of the Soviet Union R-7 (rocket family) Space launch vehicles of Russia Vehicles introduced in 1973