I think that the 1960's plans called for Moscow to be struck by about 400 warheads. Perhaps the modern ones call for less than 10, no one who knows will be able to comment I guess. In any case, not a great day to be in Moscow, London, Los Angeles, Paris... Perhaps casualties will be lower than the second world war, but I doubt it, and my guess is that they will be much higher for civilians, and that the injury count would be perhaps ten times higher due to flash burns. In any case my guess is that everyone who reads this would know people who will die in such a conflict. Not an exciting or positive thought.