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.
It's been exactly one year since [the blog author] looked at the status of the Russian space-based early-warning system. This means that [the blog author] missed the point when one of the satellites deployed on a highly-elliptical orbit, Cosmos-2469 (37170), stopped operations. The satellite, launched in September 2010, did not perform a regular orbit-keeping maneuver expected in February-March 2013. It has been drifting off the station since then.
Cosmos-2469 was reported to be the last satellite of the 73D6 type deployed on HEO, so no more HEO launches are expected. There are still two working satellites on HEO - Cosmos-2422 (launched in July 2006, it is the oldest early-warning satellite in orbit) and Cosmos-2446 (launched in December 2008). The is also one geostationary satellite - Cosmos-2479 (this is relatively new - it was launched in March 2012).
