Israel has a deal in place. No arms to Ukraine and Georgia and in return Russia won't sell to Iran. Break that and Iran will be supplied with as much as it can afford. Now, we've seen these Russian weapons in action and maybe there isn't so much to worry about. And I doubt the Russians will have any arms to spare for a long time. Might be worth changing stance. Why worry about some dusty rockets when Iran is making advanced drones? It would certainly make sense to have Ukraine on your side if Iran does go all out one day. They'll have many trained soldiers and mercenaries. Not to mention innovative and war proven arms.