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. The U.S.- and France-brokered deal, approved by Israel late Tuesday, calls for an initial two-month halt to fighting and requires Hezbollah to end its armed presence in southern Lebanon, while Israeli troops are to return to their side of the border.