Russia has recaptured a few villages in its western borderlands that Ukraine invaded over the summer, threatening Kyiv’s hold on territory it views as crucial leverage for pushing Moscow toward negotiations to end the war. In recent days, Russian troops have intensified efforts to dislodge Ukrainian forces from the bulge of territory they seized in Russia’s western Kursk region, launching several assaults spearheaded by armored vehicles. Battlefield maps compiled by independent groups using satellite images and combat footage indicate that Russian forces have driven a wedge into the western edge of the Ukrainian bulge, recapturing at least three villages. “In...