Russia lost all its early-warning satellites
The loss of early-warning satellites may seem very dramatic, but in reality it is not as important for Russia as, for example, a loss of the DSP satellites would be for the United States. The Soviet Union (and now Russia) had never had the luxury to fully rely on what is known as "dual phenomenology" in early-warning, which would require any attack to be detected by satellites and radars.
To deal with the reality of the very short detection times, the Soviet Union invested quite a bit of effort into building a command and control system that could provide insurance against a decapitating bolt out of the blue strike. The system included a number of arrangements, such as pre-delegation of authority and reliance on a number of backup communication channels that included the Perimeter command missiles (still operational, by the way). If you have a copy of the Russian Strategic Nuclear Forces book, check pages 59-66 for a detailed description (which I was told is quite accurate) In the end, there was a dual phenomenology of sorts, but the second tier was provided by the system that would detect actual nuclear detonations on the Russian soil. And, no, it was not an automatic Dead Hand.
Не были космонавты, не фиг и начинать?
http://russianforces.org/files/1985_Belyakov_Letter.pdf http://russianforces.org/blog/2015/02/russia_lost_all_its_early-warn.shtml