Pakistan has the fastest growing nuclear weapons programme in the world and by 2020 it could have enough fissile material to produce more than 200 nuclear devices, a top American think tank has said. "Though many states are downsizing their stockpiles, Asia is witnessing a buildup. Pakistan has the fastest-growing nuclear programme in the world. By 2020, it could have a stockpile of fissile material that, if weaponised, could produce as many as 200 nuclear devices," Council on Foreign Relations said.