The fall of the Assad regime in Syria is seen as a collapse of Iran's plans in the region. The ease with which rebels captured key territories surprised Israeli officials, considering the support Assad had from Russia and Iran. The fall of Assad is a blow to the Iranian project and cuts off Hezbollah from its Iranian support. However, there are concerns about jihadist rebels and the potential for weapons, including chemical weapons, to fall into the hands of hostile groups. Israel is strengthening its defense on the Golan Heights border and preparing for potential attacks.