Commandeer this ship and send it back to Iran with "humanitarian" supplies for the political resistance there. When the Iranian government complains, simply explain that you weren't doing any more or less than they were doing by sending the ship to Israeli-controlled territory. Then you should bomb their nuclear weapon facilities. Disclosure: I'm not an Isreali or a Jew, but think that anyone trying to run a military blockade after being warned deserves their fate. Remove the blockade on your own terms (e.g. when a terrorist organization doesn't control the territory). I hope you don't give into so-called "world opinion".
Thousands protest outlawing of Islamic Movement in Umm al-Fahm in northern Israel (Haaretz)