Who knows. The Russians have a history of being pretty impressive when they have to be.And the Russians have already started their vaccinations. Is that because they are pretty damn amazing or because they've rushed it?
I’m reminded of that possible urban myth about the US space pen - loads of money and research to create a pen that could pump ink in zero gravity.
The Russians? They used a pencil...
I suspect the Russian vaccine works quite well. They also probably stole some of the research from us, but then added their own bit.
Personally, I’ll stick with the “Western” vaccines.