In the early hours of Wednesday, Turkey sent tanks and warplanes across the border into Syria in a coordinated campaign with Western-backed Syrian opposition fighters to capture the town of Jarabulus, one of the Islamic State’s last strongholds on the Turkish border, which the Foreign Ministry had recently vowed to “cleanse” of the militant group. But the operation seems to be aimed more at containing the territorial ambitions of the Syrian Kurds, which Turkey sees as its primary enemy in Syria.