(ATTN: ADDS more remarks by Tillerson in last 5 paras)
WASHINGTON, Jan. 5 (Yonhap) -- U.S. Secretary of State Rex Tillerson said Friday that military action remains an option should diplomatic efforts fail to end North Korea's nuclear weapons program.
In an interview with CNN, the top U.S. diplomat was commenting on President Donald Trump's recent tweet, in which he boasted about having a "nuclear button" that is "much bigger and more powerful" than the one allegedly sitting on North Korean leader Kim Jong-un's desk.
"I think the rhetoric that North Korea understands is that while it is our objective, and the president's been very clear, to achieve a denuclearization through diplomatic efforts, those diplomatic efforts are backed by a strong military option if necessary," he said. "That is not the first choice and the president's been clear that's not his first choice, but it is important that North Koreans as well as other regional players understand how high the stakes are, in an effort to ensure our diplomatic efforts are fully supported."
Washington has led a "maximum pressure" campaign of increasing economic sanctions and diplomatic isolation to force Pyongyang to abandon its pursuit of nuclear-tipped ballistic missiles capable of striking anywhere in the U.S.
Last year, the U.N. Security Council unanimously adopted three sets of sanctions aimed at depriving the communist regime of the fuel and revenue to develop its weapons. Tillerson also noted that some countries have imposed unilateral sanctions and scaled back diplomatic ties.
"I think it is a recognition that the president has demonstrated to the world how high the stakes are. That's why we must achieve a diplomatic outcome," he said.
Tillerson warned North Korea against conducting further nuclear and ballistic missile tests.
"The North Koreans have to understand that the penalties to them will continue and will only grow more severe in terms of sanctions actions and other actions until they do get on a pathway to achieve that objective that the entire world hopes to achieve," he said, referring to the aim of denuclearizing the country.
Tensions escalated to new levels last year as Pyongyang staged its sixth nuclear bomb test and test-launched three intercontinental ballistic missiles.
In a possible sign of a thaw in inter-Korean relations, the two Koreas are set to hold high-level talks Tuesday to discuss the North's potential participation in the Winter Olympics in PyeongChang, South Korea, next month.
Tillerson said it's too early to say whether that will lead to talks between the U.S. and North Korea or on denuclearization.
"We need to wait and see what the outcome of their talks are," he said. "I know some are speculating that this might be their first effort to open a channel, but as you know, we've had channels open to North Korea for some time, so they do know how to reach us if and when they're ready to engage with us as well."
Tillerson surprised many last month when he offered to hold talks with North Korea without precondition, a proposal he backtracked on after apparent objection from the White House.
He made clear Friday that complete, verifiable and irreversible denuclearization will have to be the aim of any dialogue.
"We clearly need a signal from North Korea that they understand these talks must lead to that conclusion," he said. "The pathway of how you get there, that is the nature of a negotiation. There'll be some give and take to achieve those objectives. So that objective has never changed."
BTS-inspired webtoon to be released this week
(URGENT) 1 person recovered from Gwangju construction accident site pronounced dead: officials
(LEAD) Daily infections over 4,000 for 2nd day; imported cases hit record high
Moon expresses condolences over death of pilot in F-5E crash
(LEAD) U.S. reaffirms security commitment to S. Korea following NK missile tests
(2nd LD) N. Korean cargo train arrives in Chinese city of Dandong: sources
(3rd LD) N. Korea says it has succeeded in final test-firing of hypersonic missile
(3rd LD) N. Korea announces firing of 2 train-borne guided missiles into East Sea
(2nd LD) Ruling party's presidential candidate eyes 'de facto' unification with N. Korea
Moon not considering attending Beijing Olympics: Cheong Wa Dae
(3rd LD) N. Korea says it confirmed accuracy of tactical guided missiles in test-firing
(LEAD) Daily cases back above 4,000 amid omicron woes
Man sets himself on fire over feud with international marriage agency
Up to 5cm of snow forecast for Seoul on Wednesday afternoon
DP presidential candidate Lee apologizes over recordings containing invective