REPUBLIKA.CO.ID, WASHINGTON/SEOUL -- U.S. Secretary of State Rex Tillerson offered to begin direct talks with North Korea without pre-conditions, backing away from a key U.S. demand that Pyongyang must first accept that giving up its nuclear arsenal would be part of any negotiations.

Tillerson's new diplomatic overture comes nearly two weeks after North Korea said it had successfully tested a breakthrough intercontinental ballistic missile (ICBM) that put the entire United States mainland within range of its nuclear weapons.

"Let's just meet," Tillerson said in a speech to Washington's Atlantic Council think tank on Tuesday.

The White House later issued an ambiguous statement that left unclear whether President Donald Trump - who has said Tillerson was wasting his time pursuing dialogue with North Korea - had given his approval for the speech.

"The president's views on North Korea have not changed," the White House said. "North Korea is acting in an unsafe way ... North Korea's actions are not good for anyone and certainly not good for North Korea."

Ahead of Tillerson's speech, North Korean leader Kim Jong Un vowed to develop more nuclear weapons while personally decorating scientists and officials who contributed to the development of Pyongyang's most advanced ICBM, according to North Korean state media on Wednesday.

Kim said on Tuesday the scientists and workers would continue manufacturing "more latest weapons and equipment" to "bolster up the nuclear force in quality and quantity", the KCNA news agency reported.

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