There is the republic of Cuba, republic of Korea and the Dominican republic.
A republic is a political system which is not ruled by an emperor, a king or aristocrats (such as princes or dukes). That is all that is required to define a political system as a republic. A republic can have all sorts of regimes: democracy, authoritarianism, dictatorship and totalitarianism. Many authoritarian rulers were in charge of republics. Dictators such as Marcus (Philippines) Mubarak (Egypt) and many military dictatorships (such as those in Chile and Argentina) were in charge of republics. Nazi Germany and Stalinist Russia were republics. Communist China and North Korea are republics.
Their are Constitutional Republics (The US is one) and Monarchy Republics (The UK is one).
I think You mean Korea. China, Cuba, and Russia(Union of Soviet Socialist Republics (U.S.S.R.) were already Communist. North Korea was already communist and The USA tried to protect South Korea which was being attacked by the Viet Kong(Communist Korean Activists) but left the war.
They were independent republics.
Central Asian Republics: Kazakhstan Kyrgyzstan Tajikistan Turkmenistan Uzbekistan the transcuacasian republics: Armenia Azerbaijan Georgia
The Union of Soviet Socialist Republics
The Transcaucasian republics consist of Armenia, Azerbaijan, and Georgia. The Central Asian republics include Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan, and Uzbekistan.
Russia was by far the largest of the republics.
Federation of Arab Republics ended in 1977.
Two Republics was created on 1867-07-27.
Federation of Arab Republics was created in 1972.