In his strong, clear speech at the United Nations, President Donald Trump took credit for his accomplishments abroad while slamming the world body’s dysfunction.

His UN addresses from the start have been top-notch statesmanship — and prophetic: The Germans laughed at his 2018 warning not to depend on Russian energy . . . until the tanks rolled into Ukraine in 2022.

On Tuesday he again held a clear mirror up to the all-talk, no-walk crowd — and if the UN fails to get the message, its days may be numbered.

Trump touted America’s rebound since his return to the White House and trumpeted his effective work to “reshape the world stage”: his peace deals, his Venezuela move, his Greenland entente and, above all, his defanging of Iran.

Indeed, he vowed to “annihilate” the Islamic Republic if it refuses to make an acceptable deal.

“I have no interest in leaving dangers to grow for another day,” he explained. “So, while others have talked, I have acted.”

Hear, hear.

And while Trump unabashedly puts America’s interests first, his emphasis on action is a clear indictment of the United Nations’ failure to carry out its primary mission: to confront threats to world peace, such as Iran.

The president was even more explicit about his disdain for Turtle Bay’s efforts to impose a “far-left agenda” and for its “globalists,” “rogue” International Criminal Court, Human Rights Council and UNESCO.

Yes, “the United Nations has great, great potential,” Trump allowed; his criticisms aim to save it.

But that requires a massive shift in UN culture — and leadership.

Secretary-General António Guterres’ decade of misrule has seen the bureaucracy bloat and obsessively target Israel.  

It’s had little to say, as Trump noted, about the persecution of Christians; it failed to step up to world challenges, such as Iran.

Israel has identified nearly 1,500 UN employees as members of Hamas or allied terror groups; many joined in the Oct. 7 rape-kill-and-kidnap atrocities.

Absent deep UN reform, the world will look elsewhere, to Trump’s Board of Peace or other bodies that can do effective work.

Happily, Guterres steps down in December, and the leading candidate to replace him, Costa Rica’s Rebecca Grynspan, could prove a major improvement (despite her progressive leanings).

The League of Nations also failed its mission to address conflicts fairly and effectively — and melted away as Hitler marched.

Trump still hopes the United Nations can do better  . . .  if it listens.