Yes, easy for these folks to pretend to know what Reagan would have done since Reagan isn’t here to speak for himself.
I don’t know what he would have done, but I strongly suspect it would not be to do what Biden has been doing.
I believe Reagan would have nothing to do with the Nazi Azov military.
Internationally, Russia always made it clear what their red line was for many, many years and I don’t see Reagan ‘needing’ to cross it. I don’t see him approving of the Ukrainians shelling the separatists etc.