Answer: Moscow
Step-by-step explanation:
The Mongols took over what then could be considered as Russia when they destroyed Kiev in the early 13th century and imposed absolute rule on the Russians.
They then established Moscow as a centre of power and encouraged people to migrate to it because they thought it safe.
Under the Mongols there was much religious freedom and cultural activities were allowed to continue unabated. Huge tributes needed to be paid however.