From the map below (click on it to enlarge), it doesn’t look like it, as two-thirds of the country is a salient. A topo map of Ukraine (here) isn’t encouraging; except for the Carpathian mountains in the west, the landscape is mostly plains, steppes, and plateaus (details here). Harsh winters and spring mud hinder military movement more than the terrain. This doesn’t mean the country is a pushover. Russian invaders could expect determined resistance. But from the map, it doesn’t look like someplace you’d want to put NATO troops, as they would be encircled from the start.
