Ukraine’s Operation Vivaldi counteroffensive in the Lyman direction of Donetsk Oblast has driven recent Ukrainian advances toward Terny and nearby settlements along the Zherebets River. Ukrainian forces have recaptured multiple villages, consolidated positions west of the river, and conducted infiltrations and crossings that pressure remaining Russian pockets in the sector. These gains, reported through September and early October 2026, have reversed portions of prior Russian territorial progress and disrupted attempts to encircle Ukrainian-held areas around Lyman. Trader sentiment on re-entry timelines reflects assessments of the pace of this localized offensive, Russian defensive adjustments, and the potential for continued Ukrainian momentum or stabilization of the front line.