Carl Bildt says Sayed Pervez Kambaksh was convicted for publishing critical texts about Islam. He was smuggled into a Swedish government plane at Kabul airport while Bildt waited on board.
In an interview with Swedish daily Expressen, Bildt said the operation was coordinated with Kai Eide, the U.N.'s envoy to Afghanistan at the time.
Bildt said Kambaksh was pardoned after his escape and is now likely in the US.
He described the experience as "nerve-racking" for fear that Afghan security personnel would discover the plan.
