Russia appears to have launched its first major counterattack to drive Ukrainian forces out of Russia's Kursk region more than a month after Ukraine began its surprise offensive, according to Russian and Ukrainian sources as well as independent military analysts.Russian forces appeared already to have some success on Tuesday -- retaking some territory and driving a wedge into Ukrainian lines in Kursk, analysts said.Videos posted by pro-Russian military bloggers and geolocated by ABC News showed a large Russian armored column attacking toward the village of Snagost. Another video appears to show Ukrainian troops taken prisoner.The Russian counterattack is focused on...