International Space Station

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U.S. astronaut Steven Swanson, left, Russian cosmonauts Alexander Skvortsov, center, and Oleg Artemyev, crew members of the mission to the International Space Station (ISS) walk prior the launch of Soyuz-FG rocket at the Russian leased Baikonur cosmodrome, Kazakhstan, Wednesday, March 26, 2014. (AP Photo/Dmitry Lovetsky, Pool)

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This frame grabbed image from NASA-TV Sunday April 20, 2014 shows the SpaceX Dragon resupply capsule just prior to being captured by the Canadarm2 from the International Space Station at 7:14 a.m. EDT Sunday. (AP Photo/NASA-TV)

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This frame grabbed image from NASA-TV Sunday April 20, 2014 shows the SpaceX Dragon resupply capsule captured by the Canadarm2 from the International Space Station at 7:14 a.m. EDT Sunday. (AP Photo/NASA-TV)

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This frame grabbed image from NASA-TV Sunday April 20, 2014 shows the SpaceX Dragon resupply capsule approaching the International Space Station. It is expected to be captured by the Canadarm2, left, from the International Space Station later this morning. The pair at the time of this frame grab are traveling over the southern Atlantic Ocean. (AP Photo/NASA-TV)

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FILE - This Tuesday, March 26, 2013 file photo provided by NASA shows the release of the SpaceX Dragon-2 spacecraft from the International Space Station. NASA is pressing ahead, on Monday, April 14, 2014, with the planned launch of a supply ship despite a critical computer outage at the International Space Station, promising the situation is safe. (AP Photo/NASA)

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FILE - In this Tuesday, March 25, 2014 file photo, U.S. astronaut Steven Swanson, left, and Russian cosmonaut Alexander Skvortsov, crew members of the mission to the International Space Station, speak with relatives during pre-launch preparations at the Russian-leased Baikonur cosmodrome in Kazakhstan. Cosmonaut Oleg Artemyev is at center background. In an announcement Wednesday, April 2, 2014, NASA says it is suspending its work with Russia except for the International Space Station. The move comes a week after the space agency said U.S.-Russian space relations were fine despite Russia's annexation of the Crimean Peninsula from Ukraine. NASA employees are barred from traveling to Russia until further notice. Workers also can't email or hold teleconferences with their Russian counterparts. (AP Photo/Maxim Shipenkov, Pool, File)

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U.S. astronaut Steven Swanson, a crew member of the mission to the International Space Station (ISS) gestures prior the launch of Soyuz-FG rocket at the Russian leased Baikonur cosmodrome, Kazakhstan, Wednesday, March 26, 2014. (AP Photo/Dmitry Lovetsky, Pool)

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Oleg Ostapenko, right, head of the Russian Federal Space Agency, or Roscosmos, shakes hands with U.S. astronaut Steven, left, a crew member of the mission to the International Space Station (ISS) prior the launch of a Soyuz-FG rocket at the Russian leased Baikonur cosmodrome, Kazakhstan, Wednesday, March 26, 2014. (AP Photo/Dmitry Lovetsky, Pool)