When North Korea first lined artillery all along the border with the south, western politicians did nothing.
When North Korea first developed missile technology, western politicians did nothing.
When North Korea developed nuclear power, western politicians did nothing.
When North Korea developed its missiles to the point they can reach North America and Europe, western politicians did nothing.
Once North Korea puts a nuclear weapon on the end of one of these missiles, western politicians will do nothing.
And after the first city is nuked, politicians everywhere will scream "HOW DID THIS HAPPEN???"

You know - the same way they did after Germany Blitzkreiged ts way across Europe.