Hollywood fantasies not withstanding, partisans have been operational in Russia and Belarus since at least the war began. In fact the counter offensive heavily relies on the use of Partisan [0] for sabotage, intel, and counter intelligence and likely will remain until the War ends, and possibly longer.
I think this will end in the end o the greater Russian Federation, last weekend it got close to showing what it will take: there too many warring factions with oligarchs, personal interest and access to private paramilitaries/mercenaries (Wagner being the most obvious) will not allow their standing as the effective ruling class be let go because they no longer support Putin and will back anyone who keeps them in their lofty positions--the collapse of the Soviet Union proved that many times over.
In short, a corrupt Mafia petrol-state has many enemies in and out of it's borders; to think their aren't people ready and willing to kill for vengeance is the real sense of fiction here. Hell, throughout the war their have been many examples of these 'Bourne' types, before the rounding up of fighting age men during the mobilization last year that led to millions of men fleeing Russia, recruitment centers were set ablaze in defiance to the war.
What gets me is if everyone knows this is the inevitable outcome, wouldn't the most logical thing to do is to back Nadya from Pussy riot or Alexi's forced escape and subsequent political aspirations or campaign. (I don't personally care who governs what will likely be a smaller Russia so long as they're contained, and their nuclear weapons are static).