Since you apparently joined FR fairly recently, I suggest you read the three threads, that will give you a better idea of the general situation.
U.S. threats prodded Pakistan into shutting down nuke sales
February 9, 2004
BY DAVID BLAIR
ISLAMABAD, Pakistan -- America closed down the Pakistani-based "nuclear supermarket" by confronting President Pervez Musharraf with "mind-boggling" evidence and threatening isolation and economic sanctions, it emerged Sunday.
A high-powered American delegation met Musharraf last October and demanded that he deal with Abdul Qadeer Khan, the "father" of Pakistan's nuclear bomb, who has confessed to trading nuclear secrets.
http://www.suntimes.com/output/news/cst-nws-pak09.html