Soyuz leak cancels space station spacewalk - SpaceNews

This is not good, and I believe it will grow into a bigger problem. This most likely renders the spacecraft useless and it's the ride home for two cosmonauts and an astronaut. Furthermore, without the ability to cool the spacecraft, it will degrade and eventually become a liability attached to the ISS. Additionally, the coolant is probably ammonia based, which is corrosive to metal and is now dispersed on the outside of the ISS and the other 4 attached spacecraft. 

If the Soyuz is unusable, then Russia will have to launch another craft to the ISS and fly it in remotely. The next Soyuz mission isn't scheduled until March. Until then, that puts the existing crew in space at risk in case of an emergency. Hopefully all goes well.

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