Your challenge is to create a governing system of Russia that is democratic and decentralised, so most power lies at the equivalent to the US state level. The country should identify as part of the democratic West, and be an influential player in a democratic alliance. The democracy should be lasting to the modern day, and with no real prospect of reverting to autocracy.
POD is any time after 1850, but I'm asking here as I suspect post-1900 PODs are more likely.