The U.N. General Assembly is poised to recognize Palestine as a “non-member observer state” on Thursday, a move that will strengthen the Palestinians’ legal basis for pursuing possible war-crimes prosecutions against Israeli troops and set up a showdown with the United States and Israel.

Supporters hope the vote will provide a desperately needed political boost to Palestinian Authority President Mahmoud Abbas, whose Fatah party has been eclipsed in recent weeks by rival Hamas, the militant movement whose fortunes have risen with those of its Islamist allies in Egypt and elsewhere…

The vote is likely to roil U.N. diplomatic waters and highlight a rift in Europe over Palestinian statehood. It is also likely to provoke a diplomatic backlash from Israel and concern in Washington.

“We fear Abbas is heading for a dangerous Pyrrhic victory,” said a senior European diplomat, speaking on the condition of anonymity as per diplomatic protocol. “If the Palestinians believe it will push the Israelis into a negotiation, we don’t believe that. It might backfire for Abbas.”