The Turkish foreign minister says Turkey and the United States have reached an agreement on a plan to jointly station Turkish and U.S. forces in the Syrian Kurdish-held town of Manbij. Washington has not confirmed any such plan — and a small contingent of U.S. forces is already in Manbij. Turkey is riled by U.S. support to the Syrian Kurdish militia known as the YPG, and accuses the U.S. of allegedly not fulfilling a promise to move the Syrian Kurdish fighters in Manbij east of the Euphrates River. Ankara has threatened to expand its current offensive in northern Syria to...