Hagel and Kim also acknowledged the ongoing discussions about delaying the transfer of wartime control of South Korean forces, which would defend the country in the event of an attack by North Korea, to Seoul, and said they will continue to review the timing. The initial target date was in 2012 before it was pushed back to 2015.
"We have taken the issues that our Republic of Korea allies have raised very seriously," Hagel said, adding that the transfer timing will be based on military conditions. He said the U.S. will work with South Korea and won't make any decision that is not in the interests of both nations.
Kim said the current security situation on the peninsula in the wake of North Korea's third nuclear test earlier this year is markedly different from when the allies' operational control agreement was first signed years ago. He said the North's threat would be "very dangerous" as long as the country sticks to its weapons program.
Against the backdrop of the ongoing budget stalemate in Washington, Hagel confirmed the U.S. commitment to maintain its current force level in South Korea, which numbers about 28,500. He noted that a squadron of 30 armed reconnaissance helicopters arrived at Camp Humphreys in South Korea this week.
U.S. control of the forces is a holdover from the Korean War, and America has been trying for years to build South Korea's capabilities. But it has proved difficult to wean the South off its dependence on the U.S. military, particularly as the threat from North Korea has expanded.
In February, Pyongyang conducted an underground nuclear test in defiance of U.N. Security Council resolutions. The detonation was seen as a key step toward the North's goal of building a bomb small enough to fit on a long-range missile capable of striking the U.S.
Hagel has spent four days in South Korea, attending meetings with top leaders and ceremonies commemorating the 60th anniversary of the signing of the mutual defense treaty between the U.S. and South Korea. He also traveled up to the Demilitarized Zone between North and South Korea.
He wrapped up the visit by presiding over the transfer of command of U.S. forces in South Korea from Gen. James Thurman to Gen. Curtis Scaparrotti. Hagel then departed for Tokyo, where he'll join U.S. Secretary of State John Kerry in meetings with Japanese Prime Minister Shinzo Abe and other officials.