Ukraine’s Operation Vivaldi counteroffensive, led by the Third Army Corps, has reclaimed 125–277 square kilometers and 16 settlements north and around Lyman in Donetsk Oblast since summer 2026, reversing earlier Russian advances by the 20th and 25th Combined Arms Armies. Ukrainian forces liberated villages including Zelena Dolyna, Lypove, Kolodiazi, Ridkodub, and Nove in recent phases, disrupting Russian logistics and forcing redeployments. Lyman itself remains under Ukrainian control despite sporadic Russian attacks toward the city and its outskirts. Independent assessments confirm net Russian territorial losses in the sector during September and October, with fighting continuing near the Chornyi Zherebets River and approaches to the Sloviansk-Kramatorsk defensive belt. These battlefield shifts represent the dominant recent driver of trader consensus on timelines for full Russian capture.