Other members of NATO want the U.S. to believe that it gets something out of the alliance. But it’s hard to see what. Albania and Croatia joined the organization this year. They added geopolitical liabilities rather than military assets to NATO. Proposals to bring in Georgia and Ukraine, which are involved in complex geopolitical disputes with Russia, risk another confrontation with nuclear-armed Moscow, this one in the latter’s rather than America’s backyard, and over conflicts in which America has no stake.