I'll post a longer reply later when I have time, but I agree with you.
I don't think his posts are Russian troll farm style, they're just not anti russian. I personally am strongly anti censorship, and would rather people engage in discussion instead of just being "ban this community cause I don't agree with them". If that's the way someone feels, they can block at the account level. I don't want lemmy.ca to turn into yet another echo chamber, we all win when diverse ideas and opinions come together.
Sidebar rules are something we're talking about now as a result of this, I think the "no misinfornation" rule is a good idea but I worry about how difficult it may be to implement.
I didn't see any misinformation in the geopolitics community when I looked, but if I missed something then please feel free to flag it to me.