Who says it’s just a land grab? Putin’s vision of the world is the KGB vision of viewing America as an all encroaching entity pulling the strings and Russia being the true successor of the USSR, seen as a competing superpower balancing out that influence with its own. His ambitions are also thoroughly imperialist and revolve around the idea of rebuilding the Soviet Union. Beyond that, it’s also the most trivial dictator politics: manufacture enemies to distract the population from its real problems. Waging wars is a logical extension of cracking down on minority groups domestically as a way to stay in power.