Two satellites of the old US-KS/Oko system that until recently maintained some coverage of ballistic missile launches, stopped functioning some time in the fall of 2014, leaving Russia without space-based tier of the early-warning system. Cosmos-2422 (29260, launched in July 2006) failed to perform an orbit correction maneuver due in September 2014. Cosmos-2446 (33447, December 2008) also failed in September-October 2014 and is currently drifting off its working orbit. The Kommersant newspaper, which first reported the news, appears to have an independent confirmation of the satellites' demise.
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