What countries threatened World peace?

Several countries have historically been perceived as threats to world peace due to their military actions, aggressive foreign policies, or involvement in conflicts. Prominent examples include North Korea, with its nuclear ambitions and provocative missile tests; Russia, particularly for its actions in Ukraine and its role in various regional conflicts; and China, which has faced criticism for its territorial disputes in the South China Sea. Additionally, extremist groups and nations with unstable governments can also contribute to global tensions and instability.