Re Belarus specifically, Lukashenko advocated for peace negotiations, like it happened in 2015, he calls for Minsk-3. He is earnest about this. Not only because that happened before already and because that'd be good for his reputation, but also because Belarus generally takes a very careful still not hostile to Ukraine approach (not that Russia is hostile to Ukrainian non-combatants but still), in state media too. But that's not gonna happen anymore.

Generally, not-Belarus specific, since I've been reading a lot of Russian-language military reports, the narrative is like you say, and more specifically: Russia advances, takes a little pause, and waits for the Ukraine govt to respond to their demands (negotiations, Ukr military stands down, etc, capitulation basically); Initially, Ukr side did start talking, then refused to do the talks in Minsk, then suggested to do it in Warsaw, then just stopped responding; Russian forces advance again, take a pause; Ukr govt says "no we won't do it on your terms, if you want to talk do it on our terms"; resulting in the current full speed advancement of Russian forces atm.

Truth dies 1st during a war. And information warfare has become so much part of war. But so far, it's been mostly silence from the Russian official side re what's going on, and there's been a lot of really juvenile propaganda from the Ukrainian officials, including footage from a video game ( that even Reuters had to admit was false) . So all cards on the table I trust the Russian side much more, especially since I, as a Slav, don't want what's been happening in Ukraine to come here. But I'd also just honestly suggest to take a nap for those uninvolved, or if ppl really must know, to not believe any text without evidence, to check if footage had already been posted before but is attributed to be about something else etc etc. It's just not possible to know anything for sure atm.