BRUSSELS, September 17 (RIA Novosti) - Russian warships will continue patrolling waters off the coast of Abkhazia until all U.S. ships leave the Black Sea, Russia's NATO envoy said on Wednesday. Russia sent warships from its Black Sea fleet (Image gallery) to ensure security along the coast of Georgia's breakaway province of Abkhazia following an attempt in early August by Georgian forces to retake South Ossetia, another breakaway republic. "I think our ships will stay near the coast of Abkhazia as long as it is necessary to ensure security [in the region]," Dmitry Rogozin told a news conference in Brussels....