How much of the Americas can Russia take?

How much of the Americas can Russia take for themselves and control?
Probably not much more than OTL in most scenarios—it’s all the way across Siberia and they don’t have a good sea route to get there. That said, in a TL where they do opt to put a serious effort into colonizing it for whatever reason, they might get a fair chunk of Eastern Canada or of the Pacific coast down to central California (but probably not both).
 
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