Since the Korean War, U.S. and South Korea have established an enduring friendship with shared interests, such as denuclearizing the Korean Peninsula, combating aggression abroad and developing our economies.

This quote is talking about the relationship between the United States and South Korea since the Korean War. It suggests that since the Korean War, the two countries have built a strong and lasting friendship. They share important interests and goals, such as getting rid of nuclear weapons on the Korean Peninsula, working together to stop hostile actions by other countries, and growing their economies.