With the forces of Syrian tyrant Bashar al-Assad and his Russian allies bombing the rebel-held city of Aleppo into rubble, Secretary of State John Kerry finally played his hole card: a threat to stop talking to Vladimir Putin — who couldn’t care less.

That prompted this sarcastic joint statement from Sens. John McCain and Lindsey Graham: “Finally, a real power move in American diplomacy.”

In fact, Russian Foreign Minister Sergei Lavrov on Thursday dismissed Kerry’s demand to resume last week’s brief cease-fire, and laughed off Kerry’s threat to scrap joint military action against ISIS.

Assad’s war to keep power has already seen 400,000 civilian deaths. The assault on Aleppo looks to add tens of thousands more.

Hundreds of children are dying each day, and food and medicine are pretty much gone. Russian and Syrian jets have actually targeted humanitarian convoys, supply warehouses and aid convoys.

UN Ambassador Samantha Power says Russia is “exceeding in brutality what we have seen from the regime in the life of this war.”

But there has been no hint of any consequences for Russia, either for this savage bombardment or for failing to comply with the cease-fire — and no sign even of a backup plan.

Instead, Kerry and President Obama — desperate to avoid anything that might demand deeper US involvement in Syria before they leave office — blame Congress, claiming it would never OK the use of force.

But that’s a moot question — since Obama will never ask for it.

As Sen. Graham says, the real reason “we’re failing in Syria is because the president of the United States has come up with a strategy that doesn’t work.”