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“Now it’s Iran, but it used to be Iraq,” said Mr. Shaath. “When Netanyahu talked to [Mr. Abbas] in Washington in 2010, he was talking about his fear of the crumbling of the Hashemite Kingdom of Jordan.”

Palestinian officials have agreed to host an international force under a final-status deal.

Israeli officials say they have been chastened by the U.N. Interim Force in Lebanon, which has failed to prevent the Lebanese militant group Hezbollah from re-arming since its 2006 war with Israel.

“We in Israel have absolutely zero positive experience with international observer forces,” an Israeli official said.