One week into a new counteroffensive, Ukrainian forces are making gains in the south, with the ambitious goal of taking back most of the Russian-occupied region of Kherson by the end of the year, senior US officials and Ukrainian officials tell CNN. The last week has seen the most ambitious ground assaults by the Ukrainians since the beginning of the invasion, following sustained attacks on command posts, ammunition stores, and fuel reserves far behind the front lines, according to geolocation of video and satellite imagery. The US has observed Ukrainian forces achieve some success in attacking Russian supply lines, with...