Igor Komarov, Director of Roscosmos, makes remarks during the State Commission meeting to approve the Soyuz launch of Expedition 51 to the International Space Station, Wednesday, April 19, 2017 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Launch of the Soyuz rocket is scheduled for April 20 and will carry Expedition 51 Soyuz Commander Fyodor Yurchikhin of Roscosmos and Flight Engineer Jack Fischer of NASA into orbit to begin their four and a half month mission on the International Space Station. Photo Credit: (NASA/Aubrey Gemignani)

Igor Komarov, Director of Roscosmos, is seen during the State Commission meeting to approve the Soyuz launch of Expedition 55 to the International Space Station, Tuesday, March 20, 2018. Expedition 55 Soyuz Commander Oleg Artemyev of Roscosmos, flight engineer Ricky Arnold and flight engineer Drew Feustel of NASA are scheduled to launch to the International Space Station aboard the Soyuz MS-08 spacecraft on Wednesday, March, 21. Photo Credit: (NASA/Joel Kowsky)

Igor Komarov, Director of Roscosmos, is seen during the State Commission meeting to approve the Soyuz launch of Expedition 54 to the International Space Station, Saturday, Dec. 16, 2017 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Expedition 54 Soyuz Commander Anton Shkaplerov of Roscosmos, flight engineer Scott Tingle of NASA, and flight engineer Norishige Kanai of the Japan Aerospace Exploration Agency (JAXA) are scheduled to launch to the International Space Station aboard the Soyuz spacecraft from the Baikonur Cosmodrome on December 17. Photo Credit: (NASA/Joel Kowsky)

Expedition 55 Soyuz Commander Oleg Artemyev of Roscosmos and flight engineers Ricky Arnold and Drew Feustel of NASA report to Igor Komarov, Director of Roscosmos, prior to boarding the Soyuz MS-08 spacecraft, Wednesday, March 21, 2018 at the Baikonur Cosmodrome in Kazakhstan. Arnold, Artemyev, and Feustel launched aboard the Soyuz MS-08 spacecraft at 1:44 p.m. Eastern time (11:44 p.m. Baikonur time) on March 21 to begin their journey to the International Space Station. Photo Credit: (NASA/Joel Kowsky)

Head of Russian Federal Space Agency (Roscosmos) Igor Komarov, left, and NASA Administrator Charles Bolden are seen during an Expedition 43 post launch briefing, Saturday, March 28, 2015 at the Baikonur Hotel in Baikonur, Kazakhstan. Earlier in the morning the Soyuz TMA-16M launched to the International Space Station with Expedition 43 NASA Astronaut Scott Kelly, Russian Cosmonauts Mikhail Kornienko, and Gennady Padalka of the Russian Federal Space Agency (Roscosmos) onboard from the Baikonur Cosmodrome in Kazakhstan. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit (NASA/Bill Ingalls)

Head of Russian Federal Space Agency (Roscosmos) Igor Komarov is seen during the State Commission meeting to approve the Soyuz launch of Expedition 43 to the International Space Station, Thursday, March 26, 2015, at the Cosmonaut Hotel in Baikonur, Kazakhstan. NASA Astronaut Scott Kelly, and Russian Cosmonauts Mikhail Kornienko, and Gennady Padalka of the Russian Federal Space Agency (Roscosmos) launched to the International Space Station in the Soyuz TMA-16M spacecraft from the Baikonur Cosmodrome in Kazakhstan March 28, Kazakh time (March 27 Eastern time.) As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit (NASA/Bill Ingalls)

Expedition 43 NASA Astronaut Scott Kelly, Russian Cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) talk to NASA Administrator Charles Bolden, left center, and Head of Russian Federal Space Agency (Roscosmos) Igor Komarov, right, from behind glass before departing for their launch onboard the Soyuz TMA-16M spacecraft to the International Space Station Friday, March 27, 2015 in Baikonor, Kazakhstan. Kelly, Padalka, and Kornienko launched to the ISS from the Baikonur Cosmodrome in Kazakhstan March 28, Kazakh time (March 27 Eastern time.) As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit: (NASA/Victor Zelentsov)

Expedition 43 NASA Astronaut Scott Kelly, Russian Cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) talk to NASA Administrator Charles Bolden, center, and Head of Russian Federal Space Agency (Roscosmos) Igor Komarov, right, from behind glass before departing for their launch onboard the Soyuz TMA-16M spacecraft to the International Space Station Friday, March 27, 2015 in Baikonor, Kazakhstan. Kelly, Padalka, and Kornienko launched to the ISS from the Baikonur Cosmodrome in Kazakhstan March 28, Kazakh time (March 27 Eastern time.) As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit: (NASA/GCTC/Andrey Shelepin)