But it leaves only one significant nuclear weapons pact between Russia and the United States in place: the New START treaty. The Comprehensive Nuclear-Test-Ban Treaty, or CTBT, was an attempt under the umbrella of the United Nations to ban all nuclear tests. Adopted in 1996, it never came into effect because not enough key countries, including the United States, have ratified it. The New START is now the only nuclear weapons deal between the United States and Russia. Although Mr. Putin announced last February that Russia was suspending its participation, Russia has thus far stuck to the treaty limits.

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Persons: Russia’s, Mr, Putin, Siberia — Organizations: United Locations: United States, Russia, Ban, United Nations, Washington, Ukraine, Europe, Siberia, Moscow