Russia's army is not to great, the morale is ultra low due to the very strange Slavic hazing techniques, but Russia can still roll Uke over if they learned from Georgia. The only chance the clankers have against rf is to fight an unconventional war, and hold on until Russia nopes the fuck out of Ukraine. That is without NATO support. With NATO support, Russia would be decimated in a conventional war and would hopefully decide Crimea isn't worth going nuclear.