I don't agree with you. During the war in the Balkans as American planes were shot down? Serbia also had Russian air defense and fighter jets. Do not panic ahead of time. If we plan it right the first blow of the losses will be minimal.
The Americans are always over-confident. This can be their undoing, as even their stealth aircraft were shot down by the Serbs during the Balkan wars (using obsolete equipment). Ever heard of Zoltán Dani? On the other hand, the Koreans know that they are the under-dogs, and they are in a state of constant readiness for war.