No need for ICNM's.
Missile defense Systems can't catch what flies faster.
No nuclear Warhead, no Load to carry, much faster.
Much Boom.
Catch two birds with one Missile.
Did i already mention, it is generally not the smartest move to plaster ones Country with
nuclear Power Plants?
If one blows up a Coal Power Plant, bit of dust, some brave people die.
Blow up a nuclear Power Plant and Japan will build 50 more of them.
