Prior to selection as a cosmonaut, Chub obtained a degree in
management and
informatics from the South-Russian State Technical University (Novocherkassk Polytechnic Institute) in 2006 as the top member of his class. He subsequently obtained a graduate degree in economics from the same institution. Prior to his selection as a cosmonaut, Chub directed the astronautics firm Space Tu, LLC. He was selected as a cosmonaut candidate in 2012 and was named a test cosmonaut on June 16, 2014. In 2019 Chub participated to the training
ESA CAVES, organized by the
European Space Agency, held between
Italy and
Slovenia. Chub trained as a backup crewmember for the
Soyuz MS-12 flight to the
International Space Station, and in accordance with his Roscosmos biography, had been selected as a crewmember for the
Soyuz MS-17 mission, but was subsequently replaced by American astronaut
Kathleen Rubins. In January 2022 Chub was denied without explanation a
visa to the
United States to visit the
Johnson Space Center and to hold a five-week session there to get acquainted with the
American segment of the ISS. Roscosmos considered that the decision of the American side threatens the safety of the astronaut on the ISS. After the publication of this information, a visa for a trip to the United States was issued to Chub a few days later. Chub was again assigned as a backup crew member for
Soyuz MS-22, and then flew on
MS-24. He returned on
Soyuz MS-25 after a year long mission in space. ==References==