ISW's Verdict on Vivaldi: Russia's 2026 Donetsk Campaign Defeated — "No Basis" It Can Ever Seize the Region by Force
The strategic verdict on Operation Vivaldi landed in ISW's special report (Oct 8): the Ukrainian military "defeated Russia's 2026 campaign to seize the Donetsk region," and Putin's claims about capturing it are wrong (ISW, via Sky).
ISW's reconstruction: Russian forces had intended a "deep encirclement of the entire Fortress Belt" from the Lyman direction in the north and the Dobropillya direction in the southwest, linking up near Barvinkove in Kharkiv oblast — a maneuver that "would have largely completed the seizure of unoccupied Donetsk Oblast." Instead, Vivaldi's counterattack "impos[ed] an operational defeat on the northern Russian front," forcing Russia to "reconstitute and likely fundamentally rethink" its approach. The report's strongest line: "There is therefore no basis to assess that Russian forces will be able to take the rest of Donetsk Oblast in any short period of time, as Russian President Vladimir Putin continues to claim, or even to forecast that Russian forces will ever be able to complete their seizure of this region by force."
What it means: this closes the loop on the September ledger (46,000+ Russian casualties for negative territorial gain, per the prior revision) and converts it into an operational verdict: Putin's maximalist war aim — all of Donetsk — is now assessed as unachievable by force, full stop. That raises the stakes of the Florida talks (Moscow's freeze feelers, see Ukraine Peace Track: Miami Talks End Without a Deal — and Trump Tells Ukraine to "Get a New Leader") and of Russia's compensating strategy: terror strikes on civilians and infrastructure rather than Maneuver warfare gains.