Israel will send a delegation to Doha on Monday to advance hostage release talks, following an invitation from Egypt and Qatar, with U.S. support; This follows rising tensions over U.S.-Hamas talks, which Israel fears are bypassing it; Hamas, meanwhile, demands new terms for any cease-fire extension, including the release of hundreds of prisoners, including lifers; U.S. talks with Hamas have further strained relations, with Israel seeking veto rights over prisoner releases.