Russia has said it was planning to invite France, Germany and Turkey to an upcoming summit on the war in Syria as the war-torn country's military launched an operation to retake the final rebel-held province. Russia Foreign Minister Sergey Lavrov visited his Turkish counterpart Mevlut Cavusoglu Monday to discuss what the Russian Foreign Ministry described as "preparations for a four-lateral summit of the Russian, Turkish, German and French leaders on the Syrian settlement that is planned to be held soon," according to the state-run Tass Russian News Agency. The two men would discuss solving the crisis in Syria "through maintaining...