A ceasefire deal that went into effect on Wednesday could end more than a year of cross-border fighting between Israel and Lebanon’s Hezbollah militant group, raising hopes and renewing difficult questions in a region gripped by conflict.

Slavin said Hezbollah’s enduring power made a ceasefire in Lebanon an attractive prospect for Israel. What remains of Hamas’ organized forces is unclear, but it was apparent this week that Hezbollah remains intact, if diminished — and that it is still capable of firing missiles at Israel.

The ceasefire agreed between Israel and Hezbollah in Lebanon is good news not just because it promises to bring the terrible bloodshed of the past few months to an end. It also represents a major setback for Iran,