Israeli sources say the ceasefire is already all but non-existent, and that in any event, Hamas is massively building up its arms arsenal for a confrontation with Israel.

PA chairman Mahmoud Abbas of Fatah has broken three explicit promises he made to Israel regarding diplomatic matters, and "cannot be depended upon." So says a top Israeli government official.

Abbas, also known as Abu Mazen, is scheduled to meet with Prime Minister Ehud Olmert this Sunday. Abbas will reportedly ask Olmert to show flexibility on two issues - regarding both of which he (Abbas) has lied to Israel in the past.

Arutz-7's Haggai Huberman, to whom the source spoke on condition of anonymity, reports that the first lie occurred last June, when terrorist prisoners in Israeli jails formulated what became known as the Prisoners Document. The paper's goal was to formulates guidelines for Hamas-Fatah understandings, and called for an Arab state in all of Judea, Samaria and Gaza. It also emphasized no fewer than five times the so-called "right of return" for millions of Arabs to Israel, and encouraged further terrorism.

In meetings with Israeli officials, Abbas promised clearly that he would not support the document, which was drawn up under the leadership of arch-terrorist Marwan Barghouti. Not only did he support it, however, he made great efforts to have Hamas support it as well.

The second deception of Abu Mazen was just several weeks ago, on the eve of the Hamas-Fatah summit meeting in Mecca. Abu Mazen had promised beforehand that he would not form a unity government with Hamas unless it included the Quartet's pre-conditions: recognition of Israel and agreements signed with it, and renunciation of terrorism. In the end, however, the agreement signed in Mecca for a Hamas-Fatah unity government does not recognize Israel, does not renounce terrorism, and includes only an oblique reference to "respecting" - not "fulfilling" - past agreements with Israel.

Abu Mazen's third lie was revealed in the Maariv newspaper yesterday (Thursday). The paper reported that tax monies Israel handed over to Abbas, based on a clear understanding that they would not reach the Hamas government, in fact made their way to Hamas.

Abbas, viewed as a "moderate" by the United States and the international community, "is not trustworthy," the Israeli diplomat concluded.

However, when he meets with Olmert this Sunday, PA sources say he plans to ask the Israeli leader not to torpedo the PA unity government's activities - even though it was conceived in contrast with Abu Mazen's promise to Israel. He also intends to request of Olmert not to pressure the international community to continue its economic siege on the PA - despite the fact that previous monies given to PA were given to Hamas.

Abbas reportedly plans to say that if Olmert does not come through on the above requests, the ceasefire in Gaza will be in jeopardy.  Israeli sources say the ceasefire is already all but non-existent, and that in any event, Hamas is massively building up its arms arsenal for a confrontation with Israel.