The US is considering deploying a high-altitude drone to keep an eye on what is happening in North Korea.

Equipped with sophisticated cameras, the U.S. Global Hawk can fly twice as high as commercial aircraft but it does not carry any weapons.

Interest in monitoring the nation has been climbing since the North Korean leader Kim Jong-un began threatening nuclear strikes.

Professor Andrei Lankov, a world-renowned expert on the secretive state, is not taking the threats too seriously: