Mr. Khashoggi, the Saudi editor, argued that Saudi Arabia’s own campaign to push back against Iran without waiting for the Americans was showing signs of success. Saudi Arabian and Turkish sponsors, he said, had backed the coalition of jihadist groups that recently captured the Syrian city of Idlib in the first major victory in months against the government of President Bashar al-Assad.

One participant in the coalition was the Nusra Front, the Syrian arm of Al Qaeda, a terrorist group in the eyes of the West. But members of the jihadi coalition “are the ones who captured Idlib, it is an important development, and I think we are going to see more of that,” Mr. Khashoggi said. “Coordination between Turkish and Saudi intelligence has never been as good as now.”