Lots of countries and aid orgs have been sending generators to Ukraine for awhile now, hundreds at a time. Probably still need more though, in addition to better sources of heat like fuel oil and NG. They might have to burn some wood and coal to supplement but they'll make it. Trees aren't in abundance like in the States or Canada maybe, but they do have their own coal mines.
Use whatever is available, anything goes this winter. It will suck. If things get really bad we get the USAF involved, ship direct. Constant fuel oil and gas deliveries from Poland and Romania shouldn't be too hard to pull off though.