If Russia admits and retains as many immigrants as it currently does for the rest of this century, its population will decline by 44 percent to 81 million people; but if it blocks immigration, then the Russian population will decline by 54 percent to 68 million, according to the calculations of the To Be Precise portal. 

The growth or decline of a country’s population depends on three factors: the birthrate, the deathrate reflecting both public health and the aging of the population, and migration as people enter........

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