A bad North Korean nuclear deal is not an option and the U.S. is committed to the full dismantlement of the DPRK's WMD programme "without delay", the new U.S. Secretary of State Mike Pompeo said at his swearing-in ceremony in Washington D.C. on Wednesday.

The comments come in the lead up to the anticipated summit between North Korean leader Kim Jong Un and U.S. President Donald Trump, which is tentatively scheduled for May or June at an as yet unannounced location.