Israel's recent raids against Syrian targets are lawful and law-enforcing. Facing an increasingly dangerous Hezbollah, Jerusalem correctly understands that even a failed state has legal obligations not to assist in terrorist assaults against Israel. These obligations, concerning Syria in particular, are authoritatively codified in treaty-based and customary international law. Moreover, in consequence of Syria's active and unambiguous complicity with Hezbollah, Israel has a corresponding obligation to prevent and/or mitigate such terrorist crimes. This obligation, which Israel is undertaking well within the limitations of humanitarian international law, is owed both to citizens of the Jewish State and to the broader community of nations.