Sound Dialogue Not Possible with Trump

North Korea's apparently rapid progress in developing nuclear weapons and missiles capable of reaching the US mainland has fueled tensions that erupted into a war of words between Washington and Pyongyang this week, unnerving regional powers and global investors.

Trump's unexpected remarks prompted North Korea to say on Thursday it was finalizing plans to fire four intermediate-range missiles over Japan to land 30-40 km (18-25 miles) from Guam, adding detail to a plan first announced on Wednesday.

Guam, more than 3,000 km (2,000 miles) to the southeast of North Korea, is home to about 163,000 people and a US Navy base that includes a submarine squadron and a Coast Guard group, and an air base.

"Sound dialogue is not possible with such a guy bereft of reason and only absolute force can work on him," a report by the North's state-run KCNA news agency said of Trump.

The army will complete its plans in mid-August, ready for North Korean leader Kim Jong Un's order, KCNA reported, citing General Kim Rak Gyom, commander of the Strategic Force of the Korean People's Army.

While North Korea regularly threatens to destroy the United States and its allies, the report was unusual in its detail.

Masao Okonogi, professor emeritus at Japan's Keio University, said before the latest KCNA report that Pyongyang may be issuing a warning or advance notice of changes to its missile testing program rather than threatening an attack.

"I believe this is a message saying they plan to move missile tests from the Sea of Japan to areas around Guam," he told Reuters. "By making this advance notice, they are also sending a tacit message that what they are going to do is not a actual attack."

Experts said the detail provided by North Korea made it likely it would follow through with its plans to avoid being seen as weak or lacking in resolve.