Even China and Russia knew for sure they are no match to the USA Military. Yes, they too have Nuclear Missiles but USA has stronger and more sophisticated Nuclear defense system. US Military budget is twice more than that of Russia and China combined.
Any direct confrontation with the USA will lead to the end of China and Russia.
America is expert in Espionage, Cold Wars, and Open Confrontations. I don't see any country anywhere in the world as credible challenge. National pride may tell you differently but the reality is there's none.
We all know American`s super power is just a bluff, btw there is no counter missiles that can hit hypersonic missiles yet, the best thing they can make is another defensive hyper sonic missile but it only goes the same speed.
https://www.youtube.com/watch?v=qLV1Ao9QkpE So if used as a missile, the counter missile can never catch up but only go the same speed.
I am far more afraid of this
https://www.youtube.com/watch?v=dbWA51VwTHUThan this.
https://www.youtube.com/watch?v=GlReBmHuM5k