How will Russia's new hypersonic missile affect global arms race?

Russia says its new hypersonic weapon is a technological breakthrough on the scale of Sputnik - the first satellite launched by the Soviet Union in 1957. The Avangard is launched on top of an intercontinental ballistic missile. But unlike a regular missile warhead it can sverve sharply, making it much harder to intercept. That's worrying the U.S. - that's also having to contend with China's development of hypersonic arms. Beijing displayed the Dong Feng 17 at a military parade in October. The U.S. defence secretary has said developing the technology is a priority. So will the Avangard, which Russia says can fly at 27 times the speed of sound, change the balance of power?
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