How to be on the right side of history?

What does it mean to “be on the wrong side of history”? And what does it look like when you are? Is it the Left Party [former Communist party in Sweden] that does not want to agree to send weapons to Ukraine? Is it Putin & Co. who cannot accept that the surrounding world, the last thirty, forty, fifty? years have got a taste for things like freedom of opinion, reasonable democratic elections, “free movement”, etc.?
Is it they who advocate pacifism? Is it those who can come to no other conclusion than that Ukraine has every right to defend itself? I did unarmed service myself once. (The same winter-spring that Chernobyl exploded, by the way, and the debris swept in where we were & people couldn’t hunt and pick cloudberries.) I remember the interview before with a psychologist who tried to pressure me on how “peaceful” I really was. And I didn’t even have to lie. I just talk on from the new age spiritual world view, the ideals & the self-image I had at the time. (It was my late teens, and you’re the way you are. I was probably just a little more searching, idealistic, confused then most.)
But today I think such uncompromising pacifism is misguided. I don’t know if it’s “on the wrong side of history”, though? What “story”? The one you imagine will lead to a peaceful World Kingdom? And perhaps you want to imagine yourself as a kind of vanguard on the way there?
(Volodymyr Zelenskyy, who just spoke via link with the leaders of the European Union. He received a standing ovation.)