The US needs to continue applying the pressure. That is the only way to keep the Chinese from playing its silly games. See, they have been talking about the issues like 18 months and this is all they have accomplished? They were close to a more comprehensive agreement but, the Chinese backed down just as they were about to sign it? Those increased tariffs sure got their attention! Decoupling with the US economy can still happen if the Chinese do not get serious on the remaining issues and if they do not sign a more comprehensive trade deal. This is a small baby step so far! If the Chinese think 30% tariffs are bad, it could go up to 50% tariffs if decoupling ends up being the end goal.
Now it will take a lot of time and effort to go from nuclear program to nuclear weapons but.. if he does the other two will, UAE and Saudi who he is positioning Turkey as superior to.