Pyongyang warns Washington not to exploit 'close' Trump-Kim ties.

Islamabad -- SEOUL. North Korea said on Sunday the United States must not exploit the "close personal relations" between Kim Jong Un and Donald Trump as negotiations over Pyongyang's nuclear arsenal remain deadlocked.

Talks between Pyongyang and Washington have stalled since a second summit between Trump and Kim in Hanoi in February broke down without an agreement.

The two have since blamed each other for the failure of the summit, with the North demanding the US bring forward a "new method" by the end of the year.

Kim Yong Chol, who served as the North's counterpart to US Secretary of State Mike Pompeo until the collapse of the Hanoi meeting, credited Trump and Kim's close ties for salvaging the diplomacy, but warned they were not enough.

"There is a limit to everything," Kim, now the chairman of the Korea Asia-Pacific Peace Committee, said in a statement carried by the official KCNA news agency.

"The close personal relations can never be kept aloof from the public mindset and they are never a guarantee for preventing the DPRK-US relations from getting aggravated," he said using the acronym for the North's official name.

It was a rare statement by the former top envoy, who was...