Though I think kazans assertion about size of Ukrainians manpower relative to invading Russian manpower is relatively accurate as the Ukrainians had a large standing army. Somewhere around 600000 I think in all forms, armor, airpower, rockets and artillery it wasn’t close. It is often discussed that the major flaw in the Russian invasion operation was inadequate numbers of infantry which the Ukrainian military exploited. Later in the war the Russians had made up the gap in manpower numbers but with low trained conscripts and their armor and infantry vehicle advantage lost and to some extent artillery as well which resulted in that manpower numbers being squandered and an unexplainable throwing away large numbers of equipment in piecemeal attacks that resulted in nothing more than more scrap metal being created
It's misleading at best. Russia's numbers include only the invasion force, while Ukraine's includes their entire military, including non-combat troops and troops held in reserve far from any fighting. For Russia, add in the LPR/DPR militias, PMC's, hundreds of thousands of Air Force, Navy, Missile Forces, logistics, troops stationed in Belarus and Russia, etc, and Russian forces directly supporting the war outnumber the entire Ukraine military. As they say, figures lie and liars figure.