they re in turkey and they re in italy. and they are in germany and netherlands and belgium. reporter: what caused putin s alarm? the new report that germany is refitting its tornado attack planes to accommodate the upgraded bombs. analysts hans christiansen from a group that wants nuclear weapons arsenals reduced says the new bombs, the b-6112s will be unveiled in 2020 with a significant new feature. the new is in the tail kit, which is a guided tail kit with fins that can steer the bomb more accurately toward its target. and no nuclear bomb that s actually dropped from a plane has that, right? no. this is the first guided nuclear gravity bomb in the u.s. arsenal. reporter: each of the upgraded bombs christiansen says are three to four times more powerful than the nuclear bomb dropped on hiroshima. pentagon officials tell cnn they ve long said they had planned to refresh the nuclear arsenal they already have but are not adding weapons with new capabilities. and they point out