WASHINGTON — President Donald Trump on Saturday afternoon said in a pair of tweets that diplomacy doesn’t work with North Korea, adding, “Sorry, but only one thing will work!”

Trump did not explain what that “one thing” might be or what he meant with that posting — and White House press aides did not respond to requests for clarification.

But he has used bellicose language about North Korea and called its leader Kim Jung Un “Rocket Man” as the United States and a coalition of governments including China and Russia have sought to curb Kim’s development of nuclear weapons that can be launched on missiles.

“Presidents and their administrations have been talking to North Korea for 25 years, agreements made and massive amounts of money paid . . .,” Trump tweeted Saturday, “ . . . hasn’t worked, agreements violated before the ink was dry, makings fools of U.S. negotiators. Sorry, but only one thing will work!”

On Thursday, Trump delivered a cryptic comment to reporters as he met with top U.S. military officials and the secretary of Defense when he said that “maybe it’s the calm before the storm.”

Pressed for what the storm would be, Trump said, “You’ll find out.”

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Trump and White House press secretary Sarah Huckabee Sanders on Friday refused to explain that remark. Sanders said Trump does not like to reveal what he has planned to do.

A week ago, after news broke that Secretary of State Rex Tillerson was making direct contact with the North Korean government, Trump tweeted that he was “wasting his time.”

Trump tweeted, “Being nice to Rocket Man hasn’t worked in 25 years, why would it work now? Clinton failed, Bush failed, and Obama failed. I won’t fail.”