▁Dis position ▁Ag re ement ▁is ▁an ▁agreement ▁between ▁the ▁United ▁States ▁and ▁Russia ▁signed ▁in ▁ 2 0 0 0 . ▁An ▁am ended ▁version ▁was ▁signed ▁in ▁April ▁ 2 0 1 0 ▁and ▁went ▁into ▁effect ▁in ▁July ▁ 2 0 1 1 . ▁ ▁The ▁agreement ▁regul ates ▁the ▁conversion ▁of ▁non - ess ential ▁plut on ium ▁into ▁mixed ▁ox ide ▁( MO X ) ▁fuel ▁used ▁to ▁produce ▁electric ity . ▁Both ▁sides ▁were ▁required ▁to ▁render ▁ 3 4 ▁tons ▁of ▁weapons ▁grade ▁plut on ium , ▁into ▁re actor ▁grade ▁plut on ium ▁alongside ▁reaching ▁the ▁spent ▁fuel ▁standard , ▁that ▁is ▁mixed ▁with ▁the ▁other ▁more ▁highly ▁ir rad i ating ▁products ▁within ▁spent ▁fuel . ▁ ▁In ▁total , ▁the ▁US ▁has ▁about ▁ 9 0 ▁tons ▁of ▁weapons - cap able ▁plut on ium ▁and ▁Russia ▁has ▁ 1 2 8 ▁tons . ▁ ▁In ▁ 2 0 0 7 , ▁the ▁US ▁began ▁construct ing ▁the ▁M ixed ▁Ox ide ▁F uel ▁Fab ric ation ▁Fac ility ▁( M FF F ) ▁on ▁the ▁Sav ann ah ▁River ▁Site . ▁For ▁financial ▁reasons , ▁US ▁president ▁Bar ack ▁Ob ama ▁can ce led ▁construction ▁of ▁the ▁M FF F ▁in ▁ 2 0 1 6 ▁and ▁proposed ▁that ▁the ▁plut on ium ▁be ▁dil uted ▁with ▁non - radio active ▁material ▁and ▁dis posed ▁in ▁the ▁under ground ▁W IP P ▁facility . ▁However , ▁the ▁dil ution ▁could ▁be ▁revers