Russian President Vladimir Putin boasted Tuesday of his country's "unique" advances in hypersonic weaponry, saying other countries were "trying to catch up with us."
원문출처 : https://www.cnn.com/2019/12/25/europe/putin-russia-weapons-intl/index.html
원문출처 : https://www.cnn.com/2019/12/25/europe/putin-russia-weapons-intl/index.html