You keep singing the Chinese song. Seeing that you place so much store on them would you be prepared to give them credibility over matters where they do support or validate Pakistan's stance? If as I suspect you don't then this "Chinese thing" is just a red herring.
I'm just saying if there is damning evidence and/or you cared about it, you would have easily convinced at least one other country by now, especially if its a friend.
You have not, ergo, its not the situation.
How reliable and credible that friend is on the matter is another subject....but you haven't even gotten first base here....that says it all about the "evidence".
Certainly nothing like the Mumbai Attacks where we have Kasab and co's family members picked up for media interviews....and plenty of direct SIGINT captured originating clearly from a country and presented to all interested global peers that wanted the evidence.....especially any agents located in their countries (to squeeze for further testimony on the planning and evidence chain).
And it's not like India has never supported terrorists. Do you really want me to fish for the Indian involement in supporting, nurturing Tamil Tigers only retracting when they went Frankenstien monster on India with Rajiv recieving a exist visa from their deadly female kiss.
The point is freedom fighters and terrorists often have a fine line dont they, often from point of view and that can change over time...especially when clear targetting of civilians occur and the "frankenstein" moment commences as you say.
But tell me how the mumbai attackers were ANY notion of a freedom fighter....explain me ANY point of view where they can be?
Were they from Bombay to begin with? How did they get there to do what they did? Where did the information and training for it come? What was their stated purpose....the liberation of Bombay?
You see the yahya-ists in real power in your land dont learn from their namesake. Deliberate targetting of civilians (with absolutely no sight of a liberation goal as that would be actioned towards people with arms in the area perpetrating a claimed subjugation) only brings consequences on yourself.
Either losing half your nation or getting suffocated as long as needed economically. The consequence is all a matter of scale in the end.
Yes it can be a ex-PM assassination too for the frankenstein flip given the inertia in play even long after cutting off support (and even fighting it directly) when the frankenstein made it is most certainly not what it started out as.
But the consequences for Mumbai are just getting started....its going to be many billions of dollars and plenty of misery on your people till they take action on the Yahya-ists secure in their mansions plotting and scheming with no accountability....constantly smarting from that aforementioned entire wing-loss humiliation...and all the denial of the mass murder their lot directed that involves too.
They can't learn a lesson themselves by plain logic, so it will have to be plain brutal pressure.