yeah I assume they've done the cost-benefit and figured that if Russia gets the supplies they'll be hurt more than however much Iran can possibly retaliate - Iran does have missiles that can hit Israel so I do have to question whether they can hit Ukraine - it's not that much further - but may very well be worth it to the Ukrainians to take whatever Iran can dish than what Russia could do with the shipments. And with Iran already at war, I doubt Iran wants to spend the effort to retaliate more than whatever they consider the necessary token amount.