North Korea is a rogue, extreme totalitarian and self-isolated nation-state with nuclear weapons and ballistic missiles that has a history of aggressive and provocative military actions with western-aligned democratic nations including Japan and South Korea.

North Korea is bordered by China, Russia, and South Korea. 

The United Nations, led by the United States, went to war (1950-1953) with North Korea. No peace treaty was ever signed - and technically a state of war still exists. A DMZ (Demilitarized Zone) was established and a military stand-off between South Korea, the United States and North Korea has existed ever since.

North Korea is a major exporter of nuclear weapons technology and a major exporter of military weapons and technology, including ballistic missile tech. North Korea is credited with sharing/selling this weapons technology to Pakistan and Iran. North Korean weapons have been found on the battlefield in Ukraine used by the Russian military.