Sources

https://sputnikglobe.com/20250124/why-has-the-pentagon-failed-to-match-russia-in-hypersonic-missiles-1121487175.html
https://news.usni.org/2025/01/20/u-s-needs-to-out-think-russia-china-in-nuclear-weapon-sphere-says-outgoing-official
https://www.thespacereport.org/the-space-report-white-paper/strikes-in-ukraine-spotlight-u-s-european-deficits-in-hypersonic-arms-race/
https://www.brookings.edu/articles/ukraine-and-the-kinzhal-dont-believe-the-hypersonic-hype/
https://www.globaltimes.cn/page/202406/1314061.shtml
https://www.defensenews.com/opinion/2024/01/19/the-us-is-failing-to-quickly-field-hypersonic-missile-defense/
https://www.washingtonpost.com/business/economy/why-the-pentagon-fears-the-us-is-losing-the-hypersonic-arms-race-with-russia-and-china/2018/06/08/7c2c3b4c-57a7-11e8-b656-a5f8c2a9295d_story.html