Russia has used a new hypersonic missile to strike western Ukraine in a clear warning to Kyiv's NATO allies. It’s only the second time the missile has been used in the nearly four-year-old war. CBC’s Briar Stewart explains. »»» Subscribe to CBC News to watch more videos: http://bit.ly/1RreYWS For breaking news, video, audio and in-depth coverage: https://www.cbc.ca/news Follow CBC News on TikTok: https://www.tiktok.com/@cbcnews Subscribe to CBC News on Snapchat: https://bit.ly/3leaWsr Subscribe