Some analysts think the Russian nukes are so badly maintained they may not be operational. They are also running out of microchips and semiconductors.
To think that people here and elsewhere seriously suggested that Ukraine should just lie down and accept the invasion by this kleptocratic war criminal who has been flattening cities he claims to have "liberated" and murdering civilians - for shame.
Given the ramifications of pushing the button would be extreme, the Russians will either withdraw to pre-war positions and begin negotiations, or will step up mobilisation of conscripts in Russia in an all or nothing move. The latter would be extremely dumb as these forces would be even shitter than the "professionals" they have in Ukraine now, would be unpopular and would not have technological/armoured support.
Putin's days are numbered but unfortunately any replacement would probably come from the military/intelligence elites anyway.