The noose strangling the flow of oil to Syria tightened a notch last week, when British Royal Marines boarded a tanker carrying Iranian crude into the Mediterranean Sea through the Strait of Gibraltar. With Syria’s Iranian supplies halted, the flow will have to come from somewhere else, and...

Were the Israelis and Russians to come to blows, or if Moscow were to seriously threaten military force against Israel, could the United States risk a grave loss of prestige by not intervening to back its longtime ally? Could Russia—whose Syrian intervention is a proud symbol of its reborn...

 When top national security officials from Russia, Israel and the U.S. gather for a rare summit starting Monday, the focus will be on the country not in the room: Iran. Amid rising regional tensions, the meeting is a critical opportunity to hash out how they view the future of Iran’s...

Two years ago, almost to the day, a convoy of 20 vehicles drove toward a stretch of desert in southern Syria, near the Jordanian border. This terrain was unremarkable but for the fact that it encircled a military base known as al-Tanf where 200 American soldiers, most of them Marines...