Russia's new hypersonic missile system, which President Vladimir Putin claims is "invulnerable" to US defenses, will enter service in 2019, the Russian leader said after a test of the missile Wednesday.
원문출처 : https://www.cnn.com/2018/12/27/europe/russia-hypersonic-missile-intl/index.html
원문출처 : https://www.cnn.com/2018/12/27/europe/russia-hypersonic-missile-intl/index.html