US President Donald Trump aboard Air Force One en route to South Korea on October 29. Andrew Harnik/Getty Images

In the vacillating contours of US President Donald Trump’s foreign policy, little should surprise. And outlying moments of apparent success against Iran’s nuclear program (even if short-lived), are uneasily partnered with moments of fleeting fancy, like seizing Greenland (remember that?)

But the looming possibility of military action against Venezuela – across a wide spectrum of violent options – drags the White House into realms of foreign involvement it has always said it loathed. And it puts it squarely in opposition to the lessons of the past two decades of US Republican military endeavors, and plenty of decades of regional experience before that.

Just what exactl

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