These stats are more or less what is reported in my country. Can't fact check everything, since it's more or less the first time it got some shade. Most pro-russian populus here also support Putin and find Ukrainians as nazis, so this didn't seem far fetched.

Seeing different level of protests in Russia (against the war) and in Belarus (against Lukashenko) does show that participation was/is quite little. Even before the war, there were larger protests after Navalny.

There were a few Russians I can deeply respect and can call good russians, but they are the minority sadly. For example Ruslan Zizin.