▁nuclear ▁weapons ▁since ▁ 2 0 0 3 . ▁In ▁January ▁ 2 0 1 2 , ▁U . S . ▁Def ense ▁Secretary ▁Leon ▁Pan etta ▁stated ▁that ▁Iran ▁was ▁purs uing ▁a ▁nuclear ▁weapons ▁cap ability , ▁but ▁was ▁not ▁attempting ▁to ▁produce ▁nuclear ▁weapons . ▁In ▁ 2 0 1 2 , ▁six teen ▁United ▁States ▁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 . ▁ ▁Other ▁international ▁responses ▁ ▁United ▁Nations ▁In ▁ 2 0 0 9 , ▁the ▁United ▁Nations ▁built ▁a ▁se ism ic ▁monitoring ▁station ▁in ▁Turk men istan ▁near ▁its ▁border ▁with ▁Iran , ▁to ▁detect ▁trem ors ▁from ▁nuclear ▁explos ions . ▁The ▁UN ▁Security ▁Council ▁has ▁demanded ▁Iran ▁free ze ▁all ▁forms ▁of ▁u ran ium ▁en rich ment . ▁Iran ▁has ▁argued ▁these ▁dem ands ▁unf air ly ▁comp el ▁it ▁to ▁abandon ▁its ▁rights ▁under ▁the ▁N uc lear ▁Non Pro l ifer ation ▁Tre aty ▁to ▁peace ful ▁nuclear ▁technology ▁for ▁civil ian ▁energy ▁purposes . ▁ ▁On ▁ 2 9 ▁December ▁ 2 0 0 9 , ▁Z ongo ▁Sa id ou , ▁a ▁san ctions ▁ad visor ▁for ▁the ▁U . N ., ▁said ▁that ▁as ▁far ▁as ▁he ▁knew , ▁none ▁of ▁the ▁U . N .' s ▁member ▁nations ▁had ▁alert ed ▁the ▁san ctions ▁committee ▁about ▁alleg ations ▁of ▁sales ▁of