US President Donald Trump mocks North Korea's Kim Jong-un, calls him 'Rocket Man'

US President Donald Trump who plans to meet with South Korean President Jae-in Moon on the sidelines of the UN General Assembly. has once again mocked North Korean leader Kim Jong-Un, calling him 'Rocket Man'.

"I spoke with President Moon of South Korea last night. Asked him how Rocket Man is doing. Long gas lines forming in North Korea. Too bad!" Trump said in a Twitter post.

I spoke with President Moon of South Korea last night. Asked him how Rocket Man is doing. Long gas lines forming in North Korea. Too bad!

— Donald J. Trump (@realDonaldTrump) September 17, 2017

Meanwhile, US National Security Adviser Lt Gen H R McMaster said conceding that the new sanctions imposed on Pyongyang may not be enough.

China must take more measures to 'choke off' North Korea's resources and force it to abandon its nuclear weapons programme, he said

About a tweet US President Donald Trump sent out this morning apparently mocking Kim as "Rocket Man", McMaster said the tweet reminded him of a cover of 'The Economist' magazine a few years ago.

"But, of course, that's where the rockets are coming from. Rockets, though, we ought to probably not laugh too much about because they do represent a great threat to everyone," he said in an interview to ABC News.

On September 15, North Korea launched a medium-range ballistic missile over Japanese territory, several days after the adoption of UN Security Council Resolution 2375. 

(With agency inputs)