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Your challenge if you accept it is that with a POD later than 882, make the Russian Empire as big as possible, whilst keeping in the parameters of being plausible and avoiding any ASBs.
Things that are essential:
All slavic populations must be contained in the Empire
The Russians own Constantinople, the Bosporus and the Dardanelles
This Russian empire must have colonies in North America (this can be used to increase its size)
Things that are preferred:
The Russians own the northern parts of Norway and Sweden, or if possible, all of Scandinavia
The Russians own all of Anatolia
The Russians own all of the non-German populations of the Austrian Empire