Too much color!!!
1: I know the deal. I also know Mushy did nth amounts of corruption. Why does his son has many millions worth of properties across the US?? Similarly he "awarded" his buddies who drank "Mushy's juice" with him. As Mushy's favorite Chef refers to the Jack Daniel's Mushy likes to drink
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The point is, the money didn't go where it needed to.....and its been the case for the past 60 years!!!
2: To avoid "sanctions", you should pay cash and put stipulations in the contract about money returned in Cash also. That was another military dictatorship regime who didn't know how to negotiate. Which is why, Gen. Raheel is a big Civilian system's fan and doesn't think a general can be a legal practitioner and a negotiator. You need people with business backgrounds for that. Which are now actually working for Pakistan!!
3: There is no "change in heart"...the US likes a democratic system in Pakistan, which now exists and the country is advancing, so the US would probably like to respect a friendly growing country's request. Tell the PAF's leadership to go buy from China. No one's forcing Pakistan to "must buy jets from the US"!!! You should be thankful that the US is willing to consider the request. With Congress's mood on Pakistan, I am even surprised they did that.
Sometimes, you don't have to be this negative. Pakistani's like to live in the past, while the progressing world is passing by fast !!!