NASEEB, Syria — Syrian soldiers fanned out across towns and villages in southern Syria Saturday, celebrating the recapture of the main border crossing with Jordan by raising portraits of President Bashar Assad and tearing down rebel flags. Troops captured the Naseeb border crossing a day earlier following a crushing two-week military offensive, after rebels announced they had reached an agreement with Russian mediators to end the violence in the southern province of Daraa and surrender the crossing.Some flashed victory signs and pumped fists in the air as they chanted pro-Assad slogans. A soldier could be seen hoisting the Syrian flag...