President Obama evidently plans to spin a fine fairy tale Tuesday in his final speech at the United Nations.

UN Ambassador Sam Power hinted Obama will play up “the transformative effect” of his 2009 vow to launch an “era of engagement.” Transformative, yes — but for the worse.

As the Council on Foreign Relations’ Stewart Patrick puts it, the feeling in the UN halls is that “the world system is out of control.”

America got a chilling reminder of that with this weekend’s rash of terror scares, atop recent attacks from California to Paris and Nice. Does anyone in the West think the terror threat is reduced from the 2008 level?

Yes, ISIS is finally shrinking in Syria and Iraq — but it didn’t even exist in 2009. It emerged only after Obama prematurely pulled US troops from then-quiet Iraq, and grew after he failed to enforce his “red line” in Syria and pooh-poohed the terror group as a JV squad.

Elsewhere, the Obama-Hillary Clinton “Russian reset” was followed by the Kremlin’s theft of Crimea and intervention to save Bashar al-Assad in Syria. The “pivot to Asia”? China is pushing its neighbors hard; North Korea is working to put nukes onto ICBMs.

Iran, under its deal with Obama, is on a glidepath toward going nuclear within a decade or so — sooner if it opts out of the deal, pocketing the hundreds of billions it’s already collected.

How ironic that Power cited the president’s ’09 call for “engagement” — when he’s done everything possible to disengage.

Sure, he talks a good game. Notably, his spokesman Josh Earnest on Monday said the conflict with ISIS is a “narrative battle” — i.e., a question of who can spread a more compelling story.

That’s partly true — but realities on the ground matter, too. And it’s hard to change those when the president’s reluctant to even threaten force against America’s adversaries.

Obama won’t ignore the world’s worst woes when he speaks Tuesday — but he’ll take no responsibility for them, either. Nor for the fact that, as he nears the end of eight years in power, America is less trusted, less feared and less loved than when he took over.