Israel's ceasefire with Hamas will ease tensions with Lebanon and Egypt and decrease attacks by Yemeni Houthis, but it is unlikely to advance normalization with Saudi Arabia, while likely eventual violations of the deal will reignite regional tensions. On Jan. 15, Israel and Hamas agreed to a ceasefire that aimed to end 15 months of war in the Gaza Strip. The truce, which aims to eventually see Israel withdraw from Gaza and enable the territory to self-govern, was welcomed internationally, particularly by countries and militants that had been fighting in solidarity with Hamas. Israel's truce with the Lebanese group Hezbollah, due to expire on Jan. 26, will likely now be extended, as the Hamas-Israel ceasefire will weaken Hezbollah's rationale for intervening in the Gaza conflict. Houthi militants in Yemen, meanwhile, vowed to monitor the Gaza ceasefire and strike Israel in case of violations, but the Houthis did not commit to...