South Korean President Park Geun-hye will travel to Russia next month for a summit of the Group of 20 major economies before making a state visit to Vietnam for summit talks expected to focus on economic cooperation with the fast-growing nation, her office said Tuesday. The Sept. 4-11 trip to Russia\'s second-largest city of Saint Petersburg and the Vietnamese cities of Hanoi and Ho Chi Minh City mark Park\'s third overseas trip since taking office in early February. She earlier visited the United States in May and China in June.