FWIW, Valery Markus has a youtube channel (looks like he started it 4+ years ago). I ran across a link to footage on the Ukrainian advance, and it was his channel. Worth a watch if you want to see what the good guys are going through to gain ground. I didn’t make the connection until I saw his face. If you have no Ukrainian (yeah, me, too), turn on closed captions, select English, not sure there were other languages available.