"subduing the enemy without fighting," is the epitome of strategic thinking in his book, The Art of War. This means achieving victory through cunning, deception, and maneuvering, rather than through direct confrontation and bloodshed"
They are increasing their military knowing that US military costs 4+x as much. It might be 4x better so don't fight. Just bankrupt the US. Trump wants a $1T military budget next year.
Why would China want to conquer the West? Buying what it wants is cheaper than an uncertain military battle fought with Nukes.