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I believe the only solution here is to hire an independent third party that can assess the ground situation, and if they believe that it’s safe then team India should visit and play in Pakistan. Furthermore if team India then too refuses then ICC should heavily fine them, and lastly suspend them from the next ICC tournament to send out a strong message.
Do you really think that the ICC will suspend India from their ICC tournaments, i highly doubt that, they might levy a fine but i doubt there will be any suspension if they fail to turn up for the tournament citing security reasons.
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PCB did try that route in court and according to my knowledge, they lost every time and even had to pay fine + reimbursement to BCCI.
The reason they lost was that they failed to provide proof or a single piece of paper against BCCI.
Yes, a fine of $1.6 million was paid by PCB because they claim that a binding Memorandum of Understanding was singed while they failed to produce that and BCCI claimed that it was just a proposal.