Beyond that, anything else is probably up for negotiation.
Russian propagandists on Twitter are having a meltdown and saying some really nasty things about President Trump. Tell them to stop.
The Russians will not concede any of the annexed territory or allow a NATO military build up in what's left of Ukraine.
So IOW Putin isn't willing to make any concessions and is willing to fight to the last convict and North Korean rather than give up his vanity project.