Battalion Tactical Groups, Батальонная тактическая группа, or batal'onnaya takticheskaya gruppa, are the main Russian army unit size. BTGs as they are not are part of reforms by Sergei Shoigu implemented in 2009.
Gone now. Back to Division, Brigade and so no BTGs.
Talk to any Russian Mil officer and ask about BTG, and they will look at you funny. Never heard of them they would reply, despite what you imagine.
The putative BTG structure does not exist as found in Mechanized Infantry Brigades.
by Sergei Shoigu implemented in 2009.
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Is this the same Defense Minister that has never served in the Russian Army, who wears commemorative medals and coins on his uniform?
The same Defense Minister who’s “reform” mentioned was done away with in the following years, 2012-2020, because there was now seen a need for large units again? Those small units were the product of no large scale, intense wars in 80 years (WWII). Small units were not suited to large scale wars, and so the RGF brought back Army, Division, Brigade, and Battalion.
For example, the major RGF forces in play are the 20 Army, the 8th Army, and the 58th Army - with the 1st and 2nd Army Kores, which are not really part of the RGF. They may be from the Russian National Guard, directly under V. Putin command.
This war is a poorer WWII, but still intense and large scale necessitating large unit sizes. That said, when many units are attrited, there is a mix and match military chaos, like the disastrous river crossing a few days ago where from the number of vehicles destroyed there may have been two detached battalions of Mechanized Infantry worth of equipment wiped out.