Upvote:1
It was a diplomatic fiction. The UN was set up to represent the international power balance at the end of WWII, not just the ideals of democracy, equality, and freedom.
The capitalist winners of WWII had three permanent seats in the security council, four is you count the RoC as capitalist, while the communist winners had just one. Similar numbers in the general assembly. So the Soviets got two extra delegations with extra votes in the general assembly, but no extra veto powers -- one veto is enough to stop any action.