Not really. They were They were unable to proceed beyond the 38th parallel after the PVA counterattack, thus being unable to project force further and signed the armistice.The US was plenty able to project further force during the Korean war. McArthur wanted to use nuclear weapons. But the US didn't want to get bogged down in Asia because it's primary opponent back then was the Soviet Union. Now it's primary opponent would be China so it would go all out. The country most similar to Korea today would be Afghanistan.
Korea was in no way comparable to Afghanistan. You are either grossly misinformed or intellectually dishonest for suggesting that. Korea was a very high intensity conventional conflict that lasted 3 years and physically reshaped the entire Korean peninsula.