@AM,
US non proliferation law was first introduced in 1961, in 1989, I suspect the Pakistani government was well aware that it risked billions of dollars in financial and military assistance including Peace Gate (F-16 purchase) if Pakistan ever delivered or received, acquired or transferred nuclear enrichment technology. At the time of placing the order for seventy one F-16s you had already acquired the capability, Dr. Abdul Qadeer Khan said so in 1987, this was later corroborated by the Pakistan foreign secretary in 1992. F-16s and other advanced US weapons and billions of dollars of US assistance was the incentive on offer from the US Congress after assurances from both the US administration and Pakistani Prime Minister Benazir Bhutto that military assistance would address Pakistans security concerns and thereby keep Pakistan from acquiring the bomb. Your Prime Minister Benazir Bhutto pledged that Pakistan neither had nor would develop nuclear weapons at a joint session with US congress in Washington in 1989.
Pressler amendment was Pakistan specific, it allowed President Reagan and Bush to continue providing weapons and financial assistance by certifying that Pakistan did not possess a nuclear device. Both were later accused by Senator John Glenn in 1992 of hoodwinking the US Congress and the American taxpayer. Under immense pressure and mounting evidence, President George Bush could no longer make the certification required by Presslers amendment and on October 6th, 1990 the US government embargoed further arms deliveries to Pakistan.
Pakistan was aware of the risk it took placing the order in 1989, by the time Pakistan was sanctioned in Oct 1990 General Dynamics had already started work on building the F-16s worth 658m$ but the planes could not be delivered to Pakistan. The first batch of (Peace Gate III) eleven aircrafts were flown directly to AMARC (Aircraft Maintenance and Regeneration Center) at Davis-Monthan AFB, Arizona where they were put in 'Flyable Hold' later these were joined by seventeen more Peace Gate IV fighters. Since the government did not make a budget allocation for a refund of 658m$ the only choice was to find a buyer for the 28 F-16s in storage. A few years later and after several failed attempts at selling the planes, an agreement was reached with Pakistan in Dec 2008 to pay $326.9 million in cash and up to $140 million in other compensation to settle the eight-year dispute. The $140 million includes about $60 million in US white wheat. The remaining $80 million in compensation will be negotiated by the two sides. After reaching the agreement with President Clinton, your Prime Minister Mohammad Nawaz Sharif had this to say at a press conference the F-16 dispute has been resolved to the satisfaction of Pakistan. No accusations of theft, fraud or betrayal of trust you obviously disagree; take it up with Mr Sharif.
It was your Prime Minister Benazir Bhutto and your officials that defrauded the American taxpayer off 6 billion $ in military sales and grants between 1982 and 1990 by pledging nuclear abstinence while being only a few screw driver turns away from a fully functional nuclear device.