Russian Empire Question

If the Russian Empire was able to survive until the 1990s at the earliest, how would the demography of the empire look? With Russia itself, I heard 200 million as of the year 2000 and Ukraine and Belarus maybe 60 and 15 million respectively. I'm thinking roughly these borders (minus Kaliningrad) as the minimum, what does the demographics and economics of Russia look like with the borders of today's Russia, Ukraine and Belarus? What would be the largest cities? Could it be successful?
 
A surviving Russian Empire wouldn't contain just Russia, Ukraine, and Belarus -- there's a whole lot more territory to boot, including the Baltics, most of Poland, the Caucasus, and Central Asia. It could easily reach at least 400 million that way, assuming the excesses of the Russian Civil War, Stalin's dictatorship, and WW2 are butterflied away.
 
No Civil War, No WW2, No Holodomor, No massive industrialization policies of the soviets meaning it says mostly agrarian for longer = insane birth rates. Russia would be at minimum 500 million people and could be as high as 1 billion.
 
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