You need a Russian wank and a China/Manchu screw. And even then the majority of Russians will be more interested in settling the southern fringe of Siberia, Central Asia, and of course the Far Eastern lands you've conquered for them rather than jumping on a ship to the Northwest.
Still, you could get a pretty nice colony in Alaska down to Oregon/Northern California (not the Bay Area though, it's too valuable to remain in Russian hands) out of this. If you start in the mid-1700s, in 150 years you might have a million Russians there, which would be more than enough to prevent an effective sale to Spain, Britain, Mexico, the United States, or any other parties.