The U.S. is currently party to several wars in the greater Middle East -- against ISIS, against (someone) in Yemen, against (someone) in Somalia -- and probably some more in that area. We've indicated we'd like to stick a toe in against Boko Haram, but so far the Nigerian government is resistant. We aren't really out of Afghanistan, though the remaining U.S. sacrificial targets are ordered to keep their heads down.
We make war on the cheap these days: we infiltrate our spooks and/or mercenary contract killers; we blast the unlucky (and occasionally guilty) with drones; we only show the country's colors when these little wars pull in the full panoply of bombers and cruise missiles.
And now the usual suspects -- John McCain, various other neocons and apparently Obama's nominee to be War (Defense) Secretary Ashton Carter -- think throwing advanced U.S. arms to the Ukrainian government in Kiev would be a great idea.
Sensible people keep trying to explain to our more foolish rulers why this is stupid (in addition to pointing toward a criminal escalation of human misery). Here's University of Chicago international relations professor John J. Mearsheimer in the New York Times:
Yeah. Think how we'd react if some European power tried to arm Cuba against us ... how long has getting over that one taken?
And here's Stephen M. Walt from Harvard pointing out that jumping further into this conflict, in addition to amounting to poking a hornet's nest with nukes, is a recipe for failure and humiliation:
Among others who know better can be included the Germans.
This would be a great moment for President Obama to apply his most sophisticated policy principle: "Don't do stupid stuff!"