Secretary of State Rex Tillerson said Tuesday, after North Korea's Kim Jong-Un postponed a threat to fire missiles towards the US territory of Guam, that Washington remains ready for talks.

But the top US diplomat said it would be up to Kim when such negotiations would begin, having previously insisted Pyongyang must demonstrate that it accepts it will have to give up its nuclear program.

"I have no response to his decisions at all at this time," Tillerson said, when asked about Kim's decision to hold off. "We continue to be interested in finding ways to get to dialogue, but that's up to him."