North Korea vows to accelerate its nuclear weapons programme to "maximum pace" and test a nuclear device "at any time" in response to U.S. President Donald Trump's aggressive stance towards the regime. [https:--www.theguardian.com-world-2017-may-02-north-korea-launches-salvo-of-rhetoric-threatening-nuclear-test-at-any-time ("The Guardian")]North Korea–United States relations