"Unless the US, Israel and the Palestinians have an alternative, the Palestinian plan can not be won," Indyk told Army Radio. "If there isn't anything else, then in September there will be a vote in the UN that will recognize a Palestinian state, just like the UN recognized Israel in 1948."
Indyk explained that the US does not have veto power in the UN's General Assembly. "The US may vote against it, but that won't stop it," he said.
If a Palestinian state is declared, Israel could be considered an occupier of of a UN-member country, "and that would be an uncomfortable situation for Israel," Indyk said.
"Tactically, it is very easy for the Palestinians to go to the UN - it doesn't cost them anything, and it puts pressure on Israel," Indyk told Army Radio. "As a strategy, Israel needs to think about the day after the vote."
Indyk added that, should the UN approve a Palestinian state in September, it will prove Hamas's point, that there is no reason for negotiations, and encourage violence.