When Mr. Kerry touched down in Jeddah to meet with King Abdullah on Sept. 11, he didn't know for sure what else the Saudis were prepared to do. The Saudis had informed their American counterparts before the visit that they would be ready to commit air power—but only if they were convinced the Americans were serious about a sustained effort in Syria. The Saudis, for their part, weren't sure how far Mr. Obama would be willing to go, according to diplomats.
Wary of a repeat of Mr. Obama's earlier reversal, the Saudis and United Arab Emirates decided on a strategy aimed at making it harder for Mr. Obama to change course. "Whatever they ask for, you say 'yes,'" an adviser to the Gulf bloc said of its strategy. "The goal was not to give them any reason to slow down or back out."
Arab participation in the strikes is of more symbolic than military value. The Americans have taken the lead and have dropped far more bombs than their Arab counterparts. But the show of support from a major Sunni state for a campaign against a Sunni militant group, U.S. officials said, made Mr. Obama comfortable with authorizing a campaign he had previously resisted.
For the Saudis, Syria had become a critical frontline in the battle for regional influence with Iran, an Assad ally. As Mr. Assad stepped up his domestic crackdown, the king decided to do whatever was needed to bring the Syrian leader down, Arab diplomats say.
In the last week of August, a U.S. military and State Department delegation flew to Riyadh to lay the ground for a military program to train the moderate Syrian opposition to fight both the Assad regime and Islamic State—something the Saudis have long requested. The U.S. team wanted permission to use Saudi facilities for the training. Top Saudi ministers, after consulting overnight with the king, agreed and offered to foot much of the bill. Mr. Jubeir went to Capitol Hill to pressed key lawmakers to approve legislation authorizing the training.
For the Saudis, Syria had become a critical frontline in the battle for regional influence with Iran, an Assad ally. As Mr. Assad stepped up his domestic crackdown, the king decided to do whatever was needed to bring the Syrian leader down, Arab diplomats say.
Saudi players in attendance for the Sept. 11 meeting included Prince Bandar bin Sultan, who as the king's spymaster last year ran afoul of Mr. Kerry over Syria and Iraq policy. U.S. officials interpreted his presence as a sign the king wanted to make sure the court was united, U.S. officials said.