UNITED NATIONS - Britain joined the United States on Tuesday, declaring that it cannot support a new Palestinian draft proposal calling for peace with Israel within a year and an end of the Israeli occupation of Palestinian territories by late 2017.Jordan on Tuesday circulated to the UN Security Council a draft resolution prepared by the Palestinians, who said they want it put to a vote before Thursday. Washington said it could not support the draft because it was not constructive and failed to address Israel's security needs.British UN Ambassador Mark Lyall Grant was asked by reporters whether his delegation could support the Palestinian draft."Well no," he said. "There's some difficulties with the text, particularly language on time scales, new language on refugees. So I think we would have some difficulties."Lyall Grant did not explicitly threaten to use Britain's veto power to help block the Palestinian text if it is put to a vote. Western diplomats have said that if the draft is voted on before the new year it will likely fail to muster the required minimum nine yes votes for adoption.That would mean neither Britain nor the United States would need to use their vetoes. Washington will not hesitate use its veto to strike down the Palestinian measure if necessary, council diplomats said.