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.

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.