SEOUL -- North and South Korea marked the 65th anniversary of the start of the Korean War in June this year. The war resulted in a July 1953 truce, meaning it is not technically over.

That has led to a complicated and fragile balancing act for South Korean President Park Geun-hye. She has to keep the U.S. and China happy, and improve relations with Japan. Meanwhile, in the background North Korean leader Kim Jong Un is steadily strengthening his military.