EMP weapons can be specifically designed.
They can do a lot of damage.

If NK launched an EMP (or any other sort) of nuke at
US/Europe/Japan etc then

1) trajectory of missile would be determined
2) missile would be disabled
3) nuke subs impervious to EMP could be
'deployed'

If the NK's or anyone else for that matter managed to
reach a target in US/Europe and cause damage it would
cause said offenders Nation to be reduced to smoking
bedrock - thats top to bottom, left to right.

There will never be another 9/11 left unpunished.