Ukraine’s Operation Vivaldi counteroffensive in northern Donetsk Oblast, launched around Lyman and expanding eastward toward Sloviansk and Kramatorsk, has reversed months of Russian territorial gains. Independent assessments indicate Russia recorded a net loss of roughly 80–190 square kilometers in September 2026, with Ukrainian forces recapturing settlements, severing logistics routes, and forcing Russian redeployments. Russian milbloggers have acknowledged advances east of the Fortress Belt cities and the disruption of Moscow’s planned northern pincer for a deep encirclement. While Russian forces continue incremental pressure around Dobropillya and other sectors, overall momentum toward completing control of Donetsk Oblast has slowed. Ukrainian strikes on Russian repair units, depots, and command posts in occupied areas have further strained logistics. These battlefield shifts, set against Russia’s repeated missed deadlines for full regional control, form the core context for trader assessments of timelines for complete Russian capture.