Ukraine’s Operation Vivaldi counteroffensive in northern Donetsk Oblast has reclaimed settlements and disrupted Russian efforts to encircle the Sloviansk-Kramatorsk defensive belt, producing net Russian territorial losses in September 2026 according to independent assessments. Russian forces continue incremental advances in other sectors but at a markedly slower pace than prior years, with analysts estimating full oblast capture would require years at current rates. Ukrainian forces have consolidated gains around Lyman and improved defensive positions, while Russian logistical strains and redeployments have limited momentum. These battlefield shifts, alongside stalled progress toward remaining Ukrainian-held cities, represent the dominant recent factors shaping trader views on timelines for complete Russian control of Donetsk Oblast.