- Service ensign · official · carried by Ground Forces
- State affiliation · Ukraine
- Vigil category device · not official insignia
Identity provenance
Service ensign: Ensign of the Ukrainian Ground Forces — carried by Ground Forces, not issued to this record. The service ensign of the Ground Forces. The design itself is excluded from copyright by Article 8 of Ukraine’s Law on Copyright and Related Rights, which names symbols and signs of government authorities, the Armed Forces of Ukraine and other military formations. The file shipped is the Wikimedia Commons SVG "Ensign of the Ukrainian Ground Forces.svg", released under PD-UAexMilitary / PD-UA-exempt on that basis, so no attribution or share-alike obligation attaches. Optimised for web display; geometry unaltered.
State affiliation: Ukraine.
The smaller square mark is a Vigil category device, drawn from this record’s own domain, echelon and role — not an official insignia.
In brief
Heavy mechanized brigade formed in the later reorganisations from the 125th Territorial Defence Brigade, a Lviv formation whose 2024 Kharkiv-border record was publicly debated; reported to have joined the 3rd Army Corps in August 2025.
- Scope
- Structure, role, lineage and links. No subordinate records published.
- Subordination
- Subordination reported · from 2025-08
- Sources
- 3 on the record
- Record state
- Partial
- Broad area of activity
- The Kharkiv border sector in 2024 as a territorial brigade; corps sectors since, by public reporting. No current disposition is authored.
- Notable history
- Raised in Lviv as a territorial defence brigade in 2022, it was the formation on the Kharkiv border when the Russian offensive of May 2024 opened at Vovchansk — an episode that produced a public argument in Ukraine about fortifications, manning and who had been asked to hold what. It was subsequently converted into a heavy mechanized brigade, one of the formations the Ground Forces built by re-roling territorial brigades with heavier equipment, and in August 2025 was reported to have joined the 3rd Army Corps in the corps reform.
- Strengths
- A heavy-equipment establishment and a place in a corps built around one of the force's strongest brigades, which brings a staff and a training pipeline the brigade lacked as a territorial formation.
- Limitations
- A territorial origin, a publicly contested 2024 record, and a conversion whose completeness is not published.
Lineage & institutional history
Predecessors: 125th Territorial Defence Brigade (reported)
Under the Ground Forces until the 2025 corps reform; public compilation states the brigade joined the 3rd Army Corps in August 2025, and the corps parent is drawn from that compilation and graded reported because no official order has been read.
Key events
Operation Vivaldi retakes ground north of Lyman
Ukraine's 3rd Army Corps disclosed on 15 September 2026 an operation it named Vivaldi, after The Four Seasons, which it had run in secret in the Lyman sector since late May. It announced four phases between 15 September and 14 October and said on 19 October the operation was complete, its line on the Chornyi Zherebets river. The corps claims 277 km² and 16 settlements — nine retaken from occupation, seven cleared of infiltration. Independent mapping is lower and lags: the Institute for the Study of War found at least 147 km² around Lyman newly visible in its September mapping, and DeepState confirmed named villages phase by phase. The corps says it struck Russian logistics and drone units deep in the rear before its armour moved; ISW assessed that Ukraine likely neutralised Russian drone defences north of Lyman before the third phase. On 9 October ISW assessed that the operation had defeated the northern arm of a Russian attempt to envelop Sloviansk and Kramatorsk, which it called an operational failure for Russia.
Quick actions
System access
Where this record connects into the rest of Vigil. Each row is here because this organisation actually reaches it.
Assessed as of — 2026-07 Last reviewed — 2026-09-28
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