Obama reaffirmed the U.S. commitment to South Korea's security, and the two leaders agreed to work on a "united and strong international response to North Korea's latest reckless behavior," the White House said in a statement.

"Separately, the president congratulated President Park on the recent agreement between the ROK (South Korea) and Japan to resolve the longstanding 'comfort women' issue, and commended two of our most important allies for having the courage and vision to forge a lasting settlement to this difficult issue."