Iran threatens Israel with retaliation - but the options are limited. Experts say Iran may be forced to act because of its behavior in Gaza.

Since mid-November, Yemeni rebels have increasingly been attacking the Gulf of Aden along the Red Sea coast on the shortest route between Asia and Europe. Israel is also exposed to attacks from the Houthi rebels in Yemen. But experts doubt that Hezbollah is prepared to enter into a devastating war with Israel. It is said to have around 150,000 rockets and precision-guided munitions in close proximity to Israel.