Former national security adviser John Bolton urged the U.S. armed forces to resume military drills with South Korea after Kim Jong Un said North Korea is no longer bound to by nuclear test memorandum.

“How to respond to Kim Jong Un’s threatening New Year’s remarks? The U.S. should fully resume all canceled or down-sized military exercises in South Korea. Hold Congressional hearings on whether US troops are truly ready to ‘fight tonight’”, he tweeted.

North Korean leader also warned about getting new strategic weapons and accused the United States of introducing “gangster-like” demands.

However, Donald Trump is not worried about the warnings.

"He likes me, I like him, we get along," Trump said of Kim Jong Un.