The New York Times reports: In late 2012, just as President Obama and his aides began secretly sketching out a diplomatic opening to Iran, American intelligence agencies were busy with a parallel initiative: The latest spy-vs.-spy move in the decade-long effort to sabotage Tehran’s nuclear infrastructure.

Investigators uncovered an Iranian businessman’s scheme to buy specialty aluminum tubing, a type the United States bans for export to Iran because it can be used in centrifuges that enrich uranium, the exact machines at the center of negotiations entering a crucial phase in Switzerland this week.

Rather than halt the shipment, court documents reveal, American agents switched the aluminum tubes for ones of an inferior grade. If installed in Iran’s giant underground production centers, they would have shredded apart, destroying the centrifuges as they revved up to supersonic speed.

But if negotiators succeed in reaching a deal with Iran, does the huge, covert sabotage effort by the United States, Israel and some European allies come to an end?

“Probably not,” said one senior official with knowledge of the program. In fact, a number of officials make the case that surveillance of Iran will intensify and covert action may become more important than ever to ensure that Iran does not import the critical materials that would enable it to accelerate the development of advanced centrifuges or pursue a covert path to a bomb. [Continue reading…]