Sometimes researching first rather than sperging might seem gay, hating America, wherever.
Anyhow, somewhat contrary to my own expectations (did some looking a little while ago), it is substantially undulating, even quite mountainous in places. It might not be mountainous in the Donbass area, but the land isn't flat steppe land, or whatever is flat. Anyhow, even a relatively flat piece of land with low density housing, farms, lanes, trees, garages, workshops, chapels, industrial units, what has plenty of places to hide. I suppose the Ukrainian government will have to make a decision to engage in their own hybrid war, which Zelenskyy giving speeches in front of a map including Crimea is not (although simply refusing to concede might make Putin mad, and he already sounds tilted).