They may have stated this, explicitly. However, whether their stated intent and actual intent are one, I’d question. First question is how effectively they can even accomplish this. Second is are Japan and Korea prepared for the potential response.The Pentagon has made clear that they intend to strike all critical infrastructure and major cities on the mainland. Don't be naive in thinking this will purely end with some lost planes, ships, and subs.
I’d say don’t be naive in thinking the Pentagon is forecasting it’s actual intentions.