Many unknowns remain around Iran’s promised retaliation against Israel for its killing of a cluster of Quds Force fighters (including top brass) in Syria.

One thing is certain, however: This is President Biden’s foreign policy working by design. 

That’s why America’s most committed regional enemy is menacing our most important regional ally, as US analysts sit and mull over the size and scope of the strike — and the White House basically wrings its hands. 

Not that Iran needs to do anything big. 

Thanks to Biden, Iran already is winning the battle for regional supremacy with proxy actions.

Israel’s already fighting an Iranian proxy on one front in Gaza as another, Hezbollah, has been launching rockets across the border with Lebanon and exchanging fire with Israeli forces in what may well be a prelude to open war.  

Meanwhile, the president, guided both by short-term hopes of winning back lefty voters and by a cadre of demented lefties on his staff, has abandoned Israel. 

But from the day he took office, long before Iran struck Israel via its cat’s-paw Hamas, Biden has empowered and emboldened Tehran.  

He handed it billions in ransom and sanctions relief, broke off relations with the Saudis and did all he could to resuscitate President Barack Obama’s disastrous 2015 nuclear deal. 

And now we face the possibility of hot hostilities between Israel and Iran. 

Perhaps Biden’s calculation is that Iran will make a conservative play here. 

But if Tehran, say, dares a major strike against a soft target: What then?

The US must respond.

Biden cannot continue to base his Mideast strategy on hopes and fairy tales about Iran.

An attack by the ayatollahs cannot be shrugged off.

Whatever happens, know that Biden owns this disaster, and that absent political change in November, the policy fundamentals that produced it will go on making the world less safe.