In this video grab provided by RU-RTR Russian television via AP television on Thursday, March 1, 2018, a computer simulation shows the Avangard hypersonic vehicle maneuvering to bypass missile defenses en route to the target. Russian President Vladimir Putin has warned that he wouldn't hesitate to use nuclear weapons to ward off Ukraine's attempt to reclaim control of its occupied regions that Moscow is about to absorb. (RU-RTR Russian Television via AP, File)
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