The Soyuz TMA spacecraft

....for several weeks due to technical problems with the Soyuz spacecraft, an industry source has said. The source told Interfax that the Soyuz TMA-04M vessel had not withstood tests to its pressure chamber ahead of the planned mission on March 30 and the first flight would be postponed to mid-April or the first half of May. That mission would fly with the re-entry capsule that was due to go up on the next mission on May 30 and as a result that mission would also likely be postponed to the middle or end of June. The re-entry capsule goes inside the spacecraft and is the portion that eventually returns the astronauts to Earth when the mission is over. Russia now has sole reponsibility for taking U.S. and other international astronauts to the ISS following the withdrawal of the U.S. space shuttle, but the nation's own space program has been problem plagued by a string of problems in the last months, including difficulties with their Proton-M launch vehicle which has now caused an indefinite set back for the launch of SES' SES-4 satellite.