Unless they're literally housed inside the containment building, this is useless against precision guided missiles and bombs. Are you talking about deterrence to nuclear bombing of Chernobyl? Then it is a moot point because the fallout from the weapon itself would dwarf the dormant fissile material in the containment facility.
Sorry, but this makes no sense. If Russia wants to deter EU with fallout, they already have such a mechanism - their massive stockpile of nuclear weapons to deter aggression by EU.