New satellite images have revealed a bold move by Russia: secretly supplying North Korea with over 1 million barrels of oil this year. This discovery was made by analyzing the movement of ships between Russia and North Korea through satellite images.

Pyongyang has long coveted an advanced air-defense system to guard against missiles and war planes from the United States and South Korea.

A top South Korean official says Russia has supplied air defense missile systems to North Korea in exchange for Pyongyang sending troops.