Why would a fool want to start a winter campaign in that region? Hitler and Bonaparte both had their asses added to them by Russia (USSR). It’s not our fight. The Ukraine is not part of NATO.
Never get involved in a land war in Asia, good advice from a Sicilian
Russia will choose winter. Frozen ground or impassable bogs are the choice.
War in that region depends on how cold. Nazi’s got bogged down, literally, in Western Russia ‘cause their roads were mud, their railroads the wrong width for Germain trains, and until there was a hard freeze any transport was thru at least a foot of boggie mud.
After a hard freeze, tho, no problem with tanks or other transport. Blitzkrieg time.