This is how countries can exploit the Gap between conventional bombs and multi-mega-ton nuclear weapons.
If, for instance, a country such as France or Germany used a very low yield nuclear weapon in the 1 kt range, what could the United States do about it?
Use a B-52 and drop 500 lb bombs with minimal effect, or fire off ICBMs and cause a global nuclear war?
America must (MUST) develop tactical nuclear weapons ASAP.