Top US diplomat to return to N. Korea as Trump hails Kim

US Secretary of State Mike Pompeo signaled Wednesday that he will return to North Korea next month to push forward denuclearization talks as President Donald Trump predicted breakthroughs soon.

Pompeo met on the sidelines of the UN General Assembly session with his North Korean counterpart, Foreign Minister Ri Yong Ho, and agreed to pay his fourth trip to the longtime US arch-enemy.

Pompeo accepted an invitation from North Korean leader Kim Jong Un to return to Pyongyang in October to move ahead on efforts for "the final, fully verified denuclearization of the DPRK," the State Department said, referring to the North by its official name of the Democratic People's Republic of Korea.

Pompeo will also try to arrange a second summit between Trump and Kim, whose meeting in June in Singapore was the first ever between leaders of the two states.

Trump has hailed his initiative with North Korea as a signature foreign policy success and heaped praise on Kim.

His speech came just one year after he mocked Kim as a "rocket man" at the United Nations and threatened a forceful military response. Critics question how much North Korea has actually changed.

The regime, considered by human rights groups to be among the world's most repressive, has carried out six nuclear tests and says it has missiles that can hit the United States, although many analysts doubt its boasts.

"Kim Jong Un, a man I have gotten to know and like, wants peace and prosperity for North Korea," Trump told a special session of the UN Security Council on non-proliferation.

Trump said to expect "very good news" in the coming months and years from North Korea.

"Many things are happening behind the scenes away from the media which nobody knows, but they are happening nevertheless and they are happening in a very positive way," the president said.

But Trump also called for the enforcement of sanctions, which the United States has spent years building through the Security Council in response to North Korea's nuclear and missile tests.

"Unfortunately, to ensure this progress continues, we must enforce existing UN Security Council resolutions until denuclearization occurs," Trump said, reading from a prepared text.

"However, we have detected that some nations are already violating these UN sanctions. This includes illegal ship-to-ship transfers which must end immediately," he said.

"The safety of the Korean peninsula, the region and the world depends on full compliance."