UNITED NATIONS (AP) -- The Palestinians are certain to win U.N. recognition as a state Thursday but success could exact a high price: Israel and the United States warn it could delay hopes of achieving an independent Palestinian state through peace talks with Israel. The United States, Israel's closest ally, mounted an aggressive campaign to head off the General Assembly vote. Israeli Prime Minister Benjamin Netanyahu defiantly declared Thursday that the Palestinians would have to back down from long-held positions if they ever hope to gain independence. Ahead of Thursday's vote, thousands of Palestinians from rival factions celebrated in the streets of the West Bank. Although the initiative will not immediately bring about independence, the Palestinians view it as a historic step in their quest for global recognition. The United States, Israel's closest ally, mounted an aggressive campaign to head off the General Assembly vote. In a last-ditch move Wednesday, U.S. Deputy Secretary of State William Burns made a personal appeal to Palestinian President Mahmoud Abbas promising that President Barack Obama would re-engage as a mediator in 2013 if Abbas abandoned the effort to seek statehood. The Palestinian leader refused, said Abbas aide Saeb Erekat. With most of the 193 General Assembly member states sympathetic to the Palestinians, the vote is certain to succeed. Several key countries, including France, have recently announced they would support the move to elevate the Palestinians from the status of U.N. observer to nonmember observer state. However, a country's vote in favor of the status change does not automatically imply its individual recognition of a Palestine state, something that must be done bilaterally. The Palestinians say they need U.N. recognition of a Palestinian state in the West Bank, Gaza and east Jerusalem, the lands Israel captured in 1967, to be able to resume negotiations with Israel. They say global recognition of the 1967 lines as the borders of Palestine is meant to salvage a peace deal, not sabotage it, as Israel claims. The non-member observer state status could also open the way for possible war crimes charges against the Jewish state at the International Criminal Court. Netanyahu warned the Palestinians Thursday that they would not win their hoped-for state until they recognize Israel as the Jewish homeland, declare an end to their conflict with the Jewish state and agree to security arrangements that protect Israel. "The resolution in the U.N. today won't change anything on the ground," Netanyahu declared. "It won't advance the establishment of a Palestinian state, but rather, put it further off."