66th Separate Mechanized Brigade
The 66th Separate Mechanized Brigade, named after Prince Mstyslav the Wise, is a unit of the Ukrainian Ground Forces. It was re-established in 2023 as part of the expansion of Ukraine's mechanized forces during the full-scale Russian invasion. The brigade is part of the 3rd Army Corps and has been engaged in combat operations on the eastern front, including operations in Russia's Kursk Oblast.
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Ukraine's Third Army Corps completes fourth stage of Operation 'Vivaldi' on Lyman direction
Ukraine's Third Army Corps announced on 14 October the completion of the fourth stage of Operation 'Vivaldi' on the Lyman direction in Donetsk Oblast, reporting the return of 101 square kilometres of land and three settlements — Zelena Dolyna, Lypove, and Kolodyazi — to Ukrainian control. Commander Brigadier General Andrii Biletsky estimated Russian losses at about 3,000 personnel during this stage and roughly 8,000 across all four stages of the operation, which he said has now liberated 16 settlements and 277 km² in total.