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No
No, it is a right-wing capitalist dictatorship.
Yes. Being a Communist nation, Vietnam has a limited government much like a dictatorship, but in dictatorship, only one leader rules the nation while in communism, the society or community are at the top.
The government wherein majority of the nation's citizens have little or no voice in the manner in which they were governed is called dictatorship. This is wherein political authority is monopolized.
When Russia went communist following the Bolshevik Revolution, it became known as the Union of Soviet Socialist Republics (USSR or Soviet Union). Russia is now an Illiberal Democracy as opposed to a Communist Dictatorship. Most former Soviet States sit on the continuum from Illiberal Democracy and Dictatorship, but none are Communist anymore.
Culturally, nothing is different; one nation is free, while the other is a communist dictatorship.
Russia was communist nation. Currently Cuba is communist nation.
Brazil is not the largest; Brazil is the 5th largest nation in terms of population and area.
Vietnam is a communist nation.
America?
No.
Brazil