After Operation Vivaldi: OSINT mappers see signs of a ‘significant’ Ukrainian bridgehead at vital river

Operation Vivaldi, the five-month campaign by Ukraine’s 3rd Army Corps on the Lyman flank, was declared complete on October 14 by its commander, Brigadier General Andrii Biletskyi, who said Ukrainian troops had reclaimed 101 square kilometers in a final push and ended the operation with 277 square kilometers and 16 settlements back under Ukrainian control, at a cost of roughly 8,000 Russian casualties.

Now independent battlefield mappers say the fight on the ground has not stopped. On October 26, OSINT trackers AMK Mapping and Suriyak logged Ukrainian soldiers on the eastern bank of the Zherebets River at three settlements, Makiivka, Novosadove and Terny, which would mark the first time Ukrainian forces have operated east of the river in strength since Russia pushed across it in 2024. Suriyak described it as “a significant bridgehead.”

A separate daily front-line review covering October 27 places Ukrainian troops east of the Zherebets at those same three settlements and notes additional pressure on Zarichne and parts of Yampil, describing the sector as “expanding its positions across several sectors east of the Zherebets.”

Why the river matters

The Zherebets runs south through northern Donetsk Oblast before joining the Siverskyi Donets. Terny, in Kramatorsk Raion, sits on the eastern bank roughly 40 kilometers from Sloviansk and Kramatorsk, the twin cities that anchor Ukrainian defenses in the northern Donbas.

That is also the ground Russia used in 2024 to force its own crossing and push toward Sloviansk, a line Biletskyi said Vivaldi was designed to shut down. The 3rd Army Corps, he said at the operation’s close, had “prevented the enemy from bypassing the Sloviansk-Kramatorsk urban agglomeration from the flanks and encircling it.”

A Ukrainian bridgehead on the far bank reverses that geometry. It also exposes the units that cross to the standard risks of a wet gap: resupply over an obstacle, drone-saturated kill zones, and a Russian line that still runs along the heights east of the river.

Not yet confirmed by Kyiv

Ukrainian military command has not publicly announced any Zherebets crossing, and the reports remain the work of independent mappers reading open-source footage and geolocations. Military analyst Clément Molin, cited in the Euromaidan Press write-up, said that despite various rumors he has not been able to confirm that Ukrainians have actually crossed the river, and argued units in the sector should focus on consolidating their gains and adopting a defensive posture rather than pushing further.

The caution matches how the 3rd Army Corps has described its own method: slow, small, and infantry-led. In a post-mortem on Vivaldi published the day the operation was declared complete, US Army officers writing on the campaign said Ukraine’s gains came from “systematic, geometric interdiction and positional pressure” rather than armor thrusts, with units advancing a kilometer at a time behind drones and electronic warfare.

Kyiv Independent’s reporting on the operation describes two-man infiltration teams, long-range strikes on Russian ammunition and fuel depots as far as 200 kilometers behind the line, and a casualty ratio the corps puts at roughly 1 to 7 in Ukraine’s favor. A full-bore river assault is not that playbook.

What Kyiv is saying out loud

President Volodymyr Zelensky, speaking on October 27, said that Ukraine’s front line was in its strongest shape in a long time, citing Vivaldi as one of the year’s three landmark operations and arguing that stronger foreign air-defense support would hand Kyiv more weight at any negotiating table. His comments did not mention any crossing of the Zherebets.

This article is made and published by Jens Asbjørn Bogen, who may have used AI in the preparation