Russia's Prime Minister Vladimir Putin (front) and Russian cosmonaut Sergei Krikalyov (R) walk, with a monument of Soviet cosmonaut and first man in space, Yuri Gagarinin in the background, at Gagarin Cosmonaut Training Research Centre in Star City outside Moscow April 6, 2010. REUTERS/Sergei Remezov (RUSSIA - Tags: POLITICS SCI TECH)