The Korean Peninsula is facing a defining era. Attempts by South Korean President Moon Jae-in and U.S. President Donald Trump to repair the rift between North and South have lost any momentum as Pyongyang continues to test long-range missiles for its nuclear weapons program. As the rift between the U.S. and China grows further, South Korea may end up in the middle of the two superpowers. What does the future hold for the U.S. relationship with the  Republic of Korea?