Are We Approaching the End of the Arms Control Era?

... warheads from a Cold War peak of 70,000. But the number of nuclear weapons states has increased from five in 1968, when the Nuclear Non-Proliferation Treaty was signed, to nine today. Only one country, North Korea, has tested nuclear weapons during the ... ... warheads, and the hypersonic weapons of various types, which are being developed by Russia, the U.S., and China. End of the INF Treaty One of the most important arms control developments in recent decades has been the Intermediate-range Nuclear Forces (or INF) Treaty, signed by U.S. President ...