BRUSSELS — NATO member countries will restate their support for the world's primary nuclear non-proliferation treaty as nuclear control efforts come increasingly under strain, three NATO diplomats told POLITICO. Ambassadors from the military alliance's 32 members on Monday approved an official statement that will reiterate its backing for atomic arms control and the U.N.-backed Nuclear Non-Proliferation Treaty (NPT), according to the diplomats, granted anonymity to speak freely. The 1968 NPT