"Ukrainian National Security and Defense Council Secretary Oleksiy Danilov stated in a January 31 interview with Sky News that Russian forces are preparing for a "maximum escalation" in Ukraine within the next two to three months and may do so as soon as the next two to three weeks to coincide with the first anniversary of the Russian invasion of Ukraine.[20] Ukrainian Main Military Intelligence Directorate (GUR) Head Kyrylo Budanov stated in a January 31 interview with the Washington Post that Russian forces will focus on occupying a larger area of Luhansk and Donetsk oblasts, supporting ISW’s assessment that Russian forces appear to be preparing for an imminent offensive in eastern Ukraine, particularly in Luhansk Oblast.[21]
Budanov stated that there are currently 326,000 Russian forces fighting in Ukraine, excluding the roughly 150,000 mobilized personnel still in training grounds that Russian forces have reportedly not yet committed to hostilities.[22] The Russian military will likely continue to accumulate conventional forces in Luhansk Oblast and increase the deployment of remaining mobilized personnel to eastern Ukraine in support of an imminent decisive strategic effort in western Luhansk Oblast.[23]"
"A Russian milblogger published footage on January 29 reportedly of
Russian tank units of the 36th Separate Guards Motorized Rifle Brigade of the 29th Combined Arms Army of the Eastern Military District engaging Ukrainian tank units in the vicinity of Vuhledar.[51"
So my personal estimate of 300,000 men in Ukraine was not far from his claim. Eventually the Russians will add more than 200,000 additional troops to Ukraine.
Ukraine: 326,000 men (approx. 160K reservists/volunteers, 50K Russian military professional-contract cadre, 70,000 DPR/LPR and 50,000 PMC.)
Reserve army: over 200,000 men (approx. 150K reservists, XX,XXX volunteers, and perhaps another 50K-70K Russian military professional-contract cadre).
Battle of Vuhledar:
Ukrainian 72th and 68th brigades vs. elements of 40th and 155th Naval infantry brigade, elements of 36th Separate Guards Motorized Rifle Brigade, plus DPR elements.