It's unwise to extrapolate the US defense industry's procurement problems onto the Russians and Chinese. There's reasonable evidence to suggest the Russian Kinzhal and Zircon hypersonic missiles are already Working As Designed, or fairly close to it.[1][2]

[1]https://www.scmp.com/news/world/russia-central-asia/article/...

[2]https://en.wikipedia.org/wiki/3M22_Zircon