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He also said the agreement, if successful, “will have set a marker for the standard of behavior with respect to Iran and with respect North Korea and any rogue state (or) group that tries to reach for these kind of weapons.”

Ahead of Mr. Kerry‘s arrival, some Israeli politicians voiced skepticism, saying Mr. Assad cannot be trusted.

Intelligence Minister Yuval Steinitz said the plan was more “substantive” than earlier proposals, but he warned that the agreement’s deadline was not speedy enough and that Mr. Assad could try to hide weapons.

“We know Assad. All kinds of things could happen,” he said, adding that an agreement on chemical weapons should not absolve Mr. Assad of punishment for the acts he has committed against the Syrian people.

Avigdor Lieberman, chair of parliament’s foreign affairs and defense committee, told Army Radio that Israel would compare its own intelligence assessments of Syria’s weapons to the inventory Syria submits, which the plan requires Mr. Assad to do in a week.

“After we see the list of what Assad has handed over in a week, we can know if his intentions are serious of if it is just deception,” Mr. Lieberman said.

After the news conference, Mr. Kerry departed for Paris, where he was to discuss the Syria plan with his French, British, Turkish and Saudi counterparts on Monday.