Vladimir Putin made a terrifying boast this week, saying that Russia has hypersonic nuclear missiles that are "on alert" and capable of destroying cities in the US.
Speaking at an energy forum in Moscow, the Russian leader also said that his "intercontinental" weapons can travel five times faster than those being developed in America.
He bragged with pride: "This is not just a hypersonic, this is an intercontinental missile."This is a much more serious weapon than you just said.
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