Um, no. The Russians want a clear land bridge to their Black Sea naval bases in Crimea --something they've had since Catherine the Great ruled the lands. Something they've had until the West started trying to drag Ukraine into NATO.
That, too. But the obvious can be deceptive.
In 1968, the Red Army assumed it was going to invade Yugoslavia, because Tito had been a real jerk to Russia. And they were downright puzzled when the order came through to invade Czechoslovakia, Russia’s friendly, close ally.