According to the Trump foreign policy, alliances should materially benefit the United States. That became most apparent when the President chided Germany this week for receiving energy from a Russian pipeline. That deal, he claimed, made Germany a "captive" of Russia, presumably because German dependence on the pipeline gives Vladimir Putin leverage in geopolitical disputes. It was clear from the context of his remarks, however, that Trump resented the Germans not making themselves more economically dependent on the U.S. From an early point in his presidency, Trump has made it clear that he wants European nations to buy more American energy, making himself an open economic rival to Russia by making his pitch to Eastern European countries. When dealing with NATO, he makes it more clear that the member states should show their gratitude to the U.S. not only buy contributing more to the common defense but by buying American more often. As usual, Trump's comments on NATO have alarmed established observers. They take alarm because they see NATO idealistically as something motivated by disinterested benevolence or by a principled defense of European national sovereignty against the perpetual threat of Russia. They see NATO as a matter of duty for the "leader of the free world" to which questions of compensation, much less profit, should be immaterial. Trump and his supporters take a more contingent view, and the President's demand that our allies come across with more money will most likely play well with Americans in general so long as it's understood that it will free up American resources for American needs. Few are likely to see his approach as the miserly shortsightedness described by many pundits and politicians. I see no reason not to expect Europe to contribute more to its own defense, so long as Europeans feel the need for an extensive defense establishment. But I can't help seeing the President's whining about that pipeline as somewhat venal and slightly childish in its intention to deflect persistent gossip about his own dependence on Russia. The alliance may not be the unconditional obligation some ideologues and geostrategists think it to be, but it isn't a protection racket either, and it's not unreasonable for people to worry when a statesman seems so openly to calculate the value of an alliance as a matter of profit and loss.