Commander of Ukraine's Operational Command "East" steps down as grouping is disbanded

Why it matters

The commander of one of Ukraine's main operational formations on the eastern front is being replaced after a short tenure, signaling a significant reshuffle at the operational level of command. The grouping Nikoliuk led is being disbanded and replaced by two new formations, restructuring how Ukraine's defense of Donetsk Oblast is organized. The new "Center" and "Azov" groupings will absorb responsibility for the most heavily contested sections of the front, including the Lyman, Kramatorsk-Kostiantynivka, Pokrovsk, and Dobropillia areas.

What happened

On September 17, Major General Viktor Nikoliuk announced on Facebook that he is leaving the post of commander of Operational Command "East" (OK "Skhid"). He had been appointed to the role in April 2026, replacing Brigadier General Dmytro Bratishko, and held it for roughly five months. Under his command, the grouping was responsible for the Sloviansk, Kramatorsk, Kostiantynivka, Ocheretyne, and Pokrovsk directions of the front. In his statement, Nikoliuk said the defense forces contained the Russian advance on the Oleksandrivsk direction, blocked the enemy in Kostiantynivka, and built a stable echeloned defense on the Sloviansk and Kramatorsk directions. He added that he is handing over to his successor a fully combat-capable grouping capable of steadily conducting active defensive operations, and that his further tasks will be determined by the higher military leadership.

The announcement comes as UV "East," the force grouping Nikoliuk commanded, is being disbanded. Two new groupings are being created in its place: UV "Center," to be led by Andrii Biletsky, commander of the 3rd Army Corps and a Hero of Ukraine, and UV "Azov," to be led by Brigadier General Denys Prokopenko, commander of the 1st Corps of the National Guard "Azov." According to reporting by hromadske, Biletsky's grouping will cover the Lyman direction and the Kramatorsk-Kostiantynivka agglomeration, while Prokopenko's will cover Dobropillia and the section of the front southwest of the city. The 3rd, 11th, and 19th Army Corps will fall under Biletsky; the 1st NGU Corps, part of the 7th Airmobile Corps, and the 9th Army Corps under Prokopenko. President Zelensky publicly spoke about creating the two new groupings at the end of August.

How Ukrainian sources describe it

All coverage of this story comes from Ukrainian-language outlets, so there is no separate Ukrainian-vs-international split in the supplied set. Ukrainian outlets uniformly frame the story as a domestic military leadership change, with Nikoliuk's own Facebook post providing the core narrative. Several reports and agencies emphasize Nikoliuk's own framing of his tenure as successful, using his words as the main source. Ukrainian coverage also foregrounds the structural reorganization behind the departure: the disbanding of UV "East" and the creation of UV "Center" and UV "Azov" under Biletsky and Prokopenko, presented as a planned reform rather than a crisis.

Where reporting differs

Sources differ on how to characterize Nikoliuk's departure. One article frames it as him leaving the post of commander of OK "East"; another reports that information about his "resignation" does not correspond to reality; a third states he is returning to his permanent post as commander of OK "East" after completing his work as commander of the force grouping UV "Skhid." Sources also vary on what Nikoliuk was commanding immediately before taking over OK "East": most Ukrainian-language reports and some English reports say he previously led the operational-tactical grouping "Donetsk" (and several also name the 20th Army Corps), while one source indicates UV "Skhid" (the force grouping) is distinct from OK "Skhid" (the operational command) and that his permanent position is commander of OK "East," leaving his prior role as UV "Skhid" commander as a separate temporary assignment.

Background

Nikoliuk was appointed commander of Operational Command "East" in April 2026, succeeding Brigadier General Dmytro Bratishko, after previously leading the operational-tactical grouping "Donetsk" and the 20th Army Corps. The grouping under his command was responsible for the Sloviansk, Kramatorsk, Kostiantynivka, Ocheretyne, and Pokrovsk directions of the front. President Zelensky publicly spoke about creating two new force groupings in Donetsk Oblast at the end of August. Nikoliuk, born in 1975 in Kirovohrad Oblast, previously commanded the 92nd Separate Mechanized Brigade, the 169th Training Center "Desna," and Operational Command "North," and led the defense of Chernihiv in 2022; he was awarded the title Hero of Ukraine on 10 March 2022.