There is a lot of debate over this issue, but the countries that people generally think of when they think of Communism (Russia, China, Cuba, North Korea, Vietnam e.t.c) aren't, and weren't, Communist (except perhaps Russia, for a brief period after the Russian Revolution of 1917). Many of them were headed by Communists, but the policies enacted within these countries weren't to serve the people themselves (as is the bottom line of Communist thought), but to serve the top dogs. These countries are typically referred to as Communist States, but that's a contradiction in terms, as one of the main necessities for a country to be Communist is for the structure of the state to be demolished.
A common feature of almost all of the so called 'Communist States' is what is known as State Capitalism, where the productive forces are controlled solely by the state in a capitalistic manner, which isn't Communism. In short, none of the countries that people think of when they think of Communism were Communist. Communism is basically where the means of production are owned collectively by the working class, not the state. The Paris commune and 'anarchist' Spain are small scale examples of this.
The USSR and China both supported communism in North Korea.
adopted communism as its form of government
The Soviet Union was the center of communism. When it fell other communist countries either adopted democracy or free-market reforms.
Cuba adopted communism as its form of goverment, not the novanet answer
The US. adopted a policy of containment towards the spread of Communism. Which in summary means that the US. exercised a policy to stop the Communism movement from spreading into new countries and to contain it where it was at the time.
Which countries that are under communism , socialism and capitalism
Communism is most closely associated with the former Soviet Union (now Russia) and China. Additionally, countries like Cuba, North Korea, and Vietnam have also adopted communist ideologies to varying extents.
Truman Doctrine offered aid to countries threatened by communism in 1947.
The president adopted a policy of containment toward Soviet expansion and the spread of communism
Currently there are five countries that are still ruled by communism. -Laos -China -Vietnam -North Korea -Cuba
The US adopted a policy called 'containment'
containment
Communism:)