This mob will have no chance against NATO. They don't have much chance against Ukraine alone (albeit with NATO help). Ukraine is nailed-on to join NATO as soon as Russia is kicked out or they withdraw. As for Belarus, as soon as Putin falls, I would expect Lukashenko to do so too (he's probably already in Turkey). If the angry chef eventually takes over and turns to say, Georgia, then who knows but I would anticipate some level of support from NATO. The bigger question is what happens if Russia ends up in civil war - China will be licking their lips.