In this video grab provided by RU-RTR Russian television via AP television on Thursday, March 1, 2018, a Russian MiG-31 fighter jet releases the new Kinzhal hypersonic missile during a test at an undisclosed location in Russia. President Vladimir Putin declared Thursday that Russia has developed a range of new nuclear weapons, claiming they can't be intercepted by enemy. (RU-RTR Russian Television via AP)
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