Defense Minister Binyamin Ben-Eliezer will meet today with American mediator Gen. Anthony Zinni. Zinni issued an ultimatum of sorts yesterday when he told Israeli and Palestinian military leaders that he would leave if no real progress towards a ceasefire was achieved within the next 48 hours. He participated in a high-level session between the Israelis and PLO men yesterday. Israel understands that the ultimatum is directed more towards the Palestinian Authority.