There is no US or China angle when they are busy fighting off trade wars, south china sea, Gaza, identity wars etc etc.
This is purely a Pakistani delusional attack led by their mullah Army chief. This SOB is trying to extend his retirement and get extension and unite his country.
And lastly, the goal is final solution for Pakistan. Pakistan won't be allowed to break up naturally. Especially by china and other powers. The only way to break it up is through direct Indian action like in case of Bangladesh.