US NASA astronaut Steven Swanson (L) joins hands with Russian cosmonauts, Alexander Skvortsov (C) and Oleg Artemyev (R), in front of a mock-up of a Soyuz TMA spacecraft before their final preflight exam at the Gagarin Cosmonauts' Training Centre in Star City centre outside Moscow, on March 5, 2014. All three are scheduled to blast off to the International Space Station (ISS) from the Russian leased Kazakhstan's Baikonur cosmodrome on March 26, 2014. NASA chief Charles Bolden said today the US space agency's relationship with Russia remained normal despite the ongoing international crisis in Ukraine. AFP PHOTO (Photo credit should read -/AFP/Getty Images)
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