Why do all three superpowers forbid their citizens from associating with foreigners?

Answer 1

The three superpowers—often referring to countries like North Korea, China, and Russia—restrict their citizens from associating with foreigners to maintain control over information and limit external influences that could challenge the government's authority. These restrictions help prevent the spread of alternative viewpoints, promote nationalistic ideologies, and suppress dissent. By isolating their populations, these regimes aim to reinforce loyalty and reduce the risk of foreign ideas undermining their political stability. Such measures are often justified under the guise of protecting national security and cultural integrity.