Head of US National Aeronautics and Space Administration, NASA, Charles Bolden, speaks during a press conference in Berlin, Monday, May 19, 2014. The head of NASA has dismissed concerns that friction with Russia might spell the end of the International Space Station. Russia’s deputy prime minister said last week that his country wouldn’t cooperate with the United States on the project beyond 2020. The move followed a decision by the United States to impose sanctions on Russia over its actions in Ukraine. NASA Administrator Charles Bolden said Monday that the space station is run jointly by the U.S., Russia, Japan, Europe and Canada, and no single partner can terminate the project. (AP Photo/Michael Sohn)