So basically the Russian and their allies could own the territory north of the Great Wall, should they choose so?
But is there any serious reason to wish such a thing?
Which is exactly the point.I mean its not like the Chinese have any power projection above it. Though to be fair, neither do the Russians, its a vast area with relatively low value until the coal and iron deposits become very useful.
They already got the Dzungar Khanate and it will take a considerable time and effort to absorb it into the Russian Empire and the same goes for the Kazakh lands. Then there will be a move into the CA khanates with the same problems.But its great land and the Chinese dropped to Southern Manchuria around this time, so with a better off Russia with more sensible rulers that look east you might go to the Liao (which to me is much more realistic to hold than the Wall.
Ending up with a border on the Amur may make certain sense but even this is not a clear cut because flow of the river is quite complicated. Russia circa 1730s simply does not have resources to expand that much that far and there is no shortage of a good land and natural resources much closer to the capital (huge deposits of coal at Donetsk and iron near Kursk).