Israel once again threatening world peace

Russia officially announced that they would arm the Syrian regime with missiles earlier today. In return, Israel declared that they would take "action" in the event that Russia does in fact arm Syria with missiles. In other words, Israel is threatening to shoot Russia's missile shipment into the ocean (which they claim is already on its way to Syria). I know enough about international politics to not overreact to this kind of stuff, but in a sense this situation is different. Israel is well known to preemptively strike an enemy if they feel threatened, and especially in times of war (such as their attacks in Syria). They're an aggressive country and they usually don't make unfulfilled threats. Ivan on the other hand is the kind of country that would retaliate on such a strike. If Israel were to attack this shipment (and with Israel's reputation in mind, it could happen), Russia will certainly strike back. And of course this would force the U.S. to enter such a conflict including all of it's NATO allies. So I'm just going to hope that Israel is having a good day, and they don't feel like starting WWIII. Thoughts?