The way I understand the dispute, and please correct me if I'm wrong, is that Ukraine was formerly part of the Soviet Union.
Russia feels aggrieved that in recent years Ukraine has been trying to become part of NATO, a move that would further diminish Russia's ability to project power in the region.
NATO has already expanded into former Warsaw pact countries, and even former Soviet Republics. Russia feels they need to do something about Ukraine before Ukraine becomes one of them.
Western leaders have already broken the promise made during the cold war that NATO would not expand "one inch eastward" beyond a reunified Germany.
Please, this is not a defense by me of Russia's attack of Ukraine. I'm just describing Russia's side of the "argument" as I understand it.
Once again, correct me if I'm wrong.
I don't understand Israel's side of the argument, if you could explain to me.