46 R36, 6 with 20MT warheads, 40 with 10 1MT MIRV. 406 warheads total.
36 UR100
162 Topols
The Russian airforce doesn't have serious nukes, the land force don't have megaton scale weapons either.
R36, and UR100 in silos are the only genuine first strike option, everything else is a retaliation weapon. Only a coordinated first strike gives Russia a chance on victory, it's impossible with military C3 beheaded. The surviving military officers in bunkers in far reaches of the country would know that each of them don't have enough forces under their command to continue the war.