cy ▁and ▁Mil hol lin ▁based ▁on ▁I AE A ▁data ▁concluded ▁that ▁Iran ▁could ▁produce ▁enough ▁weapons - grade ▁u ran ium ▁for ▁one ▁nuclear ▁war head ▁in ▁ 1 . 7 ▁months . ▁In ▁ 2 0 1 2 , ▁six teen ▁U . S . ▁intelligence ▁ag encies , ▁including ▁the ▁C IA , ▁reported ▁that ▁Iran ▁was ▁purs uing ▁research ▁that ▁could ▁enable ▁it ▁to ▁produce ▁nuclear ▁weapons , ▁but ▁was ▁not ▁attempting ▁to ▁do ▁so . ▁The ▁senior ▁officers ▁of ▁all ▁of ▁the ▁major ▁American ▁intelligence ▁ag encies ▁stated ▁that ▁there ▁was ▁no ▁conclus ive ▁evidence ▁that ▁Iran ▁has ▁made ▁any ▁attempt ▁to ▁produce ▁nuclear ▁weapons ▁since ▁ 2 0 0 3 . ▁In ▁a ▁ 2 0 0 7 ▁National ▁Int elligence ▁Est imate , ▁the ▁United ▁States ▁Int elligence ▁Community ▁ass essed ▁that ▁Iran ▁had ▁ended ▁all ▁" n uc lear ▁weapon ▁design ▁and ▁weapon ization ▁work " ▁in ▁ 2 0 0 3 . ▁U . S . ▁Def ense ▁Secretary ▁Leon ▁Pan etta ▁stated ▁in ▁January ▁ 2 0 1 2 ▁that ▁Iran ▁was ▁purs uing ▁a ▁nuclear ▁weapons ▁cap ability , ▁but ▁was ▁not ▁attempting ▁to ▁produce ▁nuclear ▁weapons . ▁In ▁ 2 0 0 9 , ▁U . S . ▁intelligence ▁ass essed ▁that ▁Iran ian ▁intent ions ▁were ▁unknown . ▁Some ▁European ▁intelligence ▁believe ▁Iran ▁has ▁res umed ▁its ▁alleg ed ▁nuclear ▁weapons ▁design ▁work . ▁Russian ▁Prime ▁Minister ▁Vladimir ▁Put in ▁said ▁he ▁had ▁seen ▁no ▁evidence ▁of ▁any ▁nuclear