If you want to blame someone for the US being asleep at the wheel while Russia developed hypersonic missile technology, you might start with who was around 10 years ago. It takes at least that long to develop a new missile technology. That would be Obama and his intelligence agencies.
Trump should have denounced Russia when they first announced they had them, but Trump is so busy with his bromance with Putin that he apparently doesn't care.
Yea...I’m sure Russia would stop its advanced weapons programs if President Trump would had “denounced” them, whatever the fuck that entails.