What makes this newsworthy? Is the only launch site in the west? The width of Korea can't be that important for an ICBM and I'd assume the US could strike just about everywhere in North Korea before they had a chance to respond.
Did you read the article?
"North Korea has launch facilities for its missile program on its west coast..."
Does it not have them on it's east coast or anywhere else? There was no context for what makes this significant.
Hmmm...I must have missed the question in your original comment about the significance of west coast (or it was edited afterwards).