Sergey Prokopyev is a Russian cosmonaut who launched on his first spaceflight aboard Soyuz MS-09 on June 6, 2018, spending 197 days in space as a flight engineer on Expedition 56/57. He launched a second time aboard Soyuz MS-22 on September 21, 2022, and returned to Earth aboard Soyuz MS-23 on September 27, 2023.
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