Experts with whom Newsweek spoke scrutinized Putin's stated goal to "denazify" Ukraine through the "special military operation" ordered last week amid months of Russian military buildup along the neighboring country's borders. But these experts have also long raised the alarm about a growing far-right and even neo-Nazi community operating in paramilitary groups and within the Ukrainian Armed Forces themselves.

Investigative journalist Oleksiy Kuzmenko has specialized in studying the phenomena of the far-right among Ukraine's military and paramilitary groups. He told Newsweek that the country's resistance against Russia appears to be "a whole of society effort," and argued that "Putin's claimed 'Denazification' pretext for the invasion and current spins from Moscow that its forces are only fighting 'nationalist battalions' as opposed to regular military are propagandist."

"That being said," Kuzmenko added, "the internationally active far-right Azov movement, via its political wing the National Corps party, appears to be involved in the fight against Russia in a number of Ukrainian cities, including Kyiv and Kharkiv, as part of the territorial defense forces."

The involvement of the Azov movement appears to be evolving.