North Korea could become 'great economic power' without nukes: Trump

US President Donald Trump on Sunday said North Korea could become one of the world's "great economic powers" if it relinquished its nuclear arsenal, ahead of his summit with Kim Jong Un.

In a series of tweets on the eve of his departure for this week's summit in Hanoi, Trump also praised China and Russia for enforcing sanctions on North Korea while insisting he had a "great relationship with Chairman Kim."

"Chairman Kim realises, perhaps better than anyone else, that without nuclear weapons, his country could fast become one of the great economic powers anywhere in the world. Because of its location and people (and him), it has more potential for rapid growth than any other nation!" he wrote.