Which of the following nations is currently recognized as a communist nation?

Cuba is recognized as a communist nation due to its political system and the ideology that governs its government. Since the Cuban Revolution in 1959, the country has been ruled by a one-party socialist state under the Communist Party of Cuba. The state controls key aspects of the economy and society, emphasizing collective ownership and distribution of resources, as well as central planning. These characteristics are fundamental to the definition of a communist nation.

In contrast, South Korea, Brazil, and Ukraine do not adhere to communist ideologies. South Korea operates as a democratic republic with a market-oriented economy. Brazil is also a democratic country that promotes a mixed economy, while Ukraine, despite its various political challenges, is recognized as a sovereign nation with a parliamentary system and a market-based economy. Thus, Cuba stands out as the only nation among the options that fits the definition of a communist state.