For former CIA chief David Petraeus, the Russian leader has miscalculated — big time. The Russian president shook the tree, and what came out is NATO unity — exactly the opposite of what he was counting on.

"Putin has managed to unite NATO in a way that nothing else has since the end of the Cold War, other than his annexation of Crimea and invasion of the Donbas in 2014," he explains. "He has really given NATO a reason to live again."

What's more, Petraeus thinks Putin is now digesting the "porcupine" he's eaten, which won't go down easily.