From left, Roscosmos cosmonauts Dmitri Petelin, Sergey Prokopyev and NASA astronaut Frank Rubio wave to relatives before heading to the International Space Station.(Dmitri Lovetsky/AP)The Russian space agency is deciding whether it needs to send a rescue spacecraft to the International Space Station to bring home two cosmonauts and a NASA astronaut after the Soyuz capsule that brought them there suffered a massive coolant leak.
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