Putin signs bill revoking Russia’s ratification of a global nuclear test ban treaty

President Vladimir Putin on Thursday signed a bill revoking Russia's ratification of a global nuclear test ban, a move that Moscow said was needed to establish parity with the United States. Putin has said that rescinding the ratification of the Comprehensive Nuclear Test Ban Treaty, also known as the CTBT, would “mirror” the stand taken by the U.S., which has signed but not ratified the nuclear test ban.