An oxygen-supply system on the space station's Russian side has failed

NASA
The oxygen-supply system on the International Space Station's Russian segment failed this week.
Crew members aren't in danger, since the station has another oxygen system on its US segment.
But the issue is the latest in a string on the station's Russian side — there has also been a broken toilet and an air leak. 
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The International Space Station is starting to show its age, particularly on the Russian side. In the last few month