(ANSA) - BELGRADE, JUN 20 - Russian Foreign Minister Sergei Lavrov reiterated Moscow's full support for Serbia in defending its national interests, particularly its territorial integrity and national sovereignty on the Kosovo issue, during a meeting today in St. Petersburg with Nenad Popovic, Serbia's minister without portfolio in charge of international economic cooperation. According to media reports in Belgrade, the meeting took place on the sidelines of the International Economic Forum, which is currently taking place in the northern Russian city, and Popovic participated actively by speaking on various panels. (ANSA).