Ukrainian forces have conducted a surprising and aggressive incursion into Russia's Kursk region, capturing the town of Sudzha and over 80 other settlements, covering approximately 444 square miles. Videos released by the Ukrainian military depict intense battles, missile strikes, and the surrender of Russian troops, with Ukrainian soldiers taking down Russian flags and establishing command posts in captured territories. Ukrainian President Volodymyr Zelenskyy described the operation as a major morale boost and a significant shift in the 2½-year-old conflict. Russia has struggled to mount an effective response, leading to mass evacuations and the relocation of thousands of civilians. The Ukrainian advance has been marked by careful planning and execution, aiming to sustain and possibly expand the gains made despite potential Russian counterattacks. International reactions have been mixed, with U.S. President Joe Biden closely monitoring the situation and emphasizing that Washington is not involved in the planning of the operation.