President Donald Trump tweeted today that "only one thing" will work when it comes to the North Korea crisis, and it's not direct diplomacy.

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

It's unclear what the "one thing" is, but Trump has boisterously threatened military action before and some have interpreted these tweets as a continuation.

"Extremely reckless to implicitly threaten [North Korea] with military strike," former CIA Deputy Director David Cohen wrote on Twitter. "Just baiting KJU [Kim Jong Un] to strike first. Then what? Paging [Defense Secretary James] Mattis and [Chief of Staff John] Kelly."

North Korea has previously interpreted a tweet from Trump as a declaration of war. Separately, one week ago, Trump tweeted that he had advised Secretary of State Rex Tillerson that he was "wasting his time" trying to talk to "Little Rockets Man," Trump's nickname for Kim.

"Save your energy Rex, we'll do what has to be done!" Trump tweeted then.

Related: Trump Says Negotiations With North Korea Are a Waste of Time

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