President Barack Obama talked by phone on Wednesday with Japanese Prime Minister Shinzo Abe about the international response to North Korea's nuclear test, the White House said.
Obama reaffirmed the U.S. commitment to Japan's security and the two leaders "agreed to work together to forge a united and strong international response to North Korea's latest reckless behavior," the White House said in a statement.
"Separately, the President congratulated Prime Minister Abe on the recent agreement between Japan and the ROK (South Korea) to resolve the longstanding 'comfort women' issue," the statement said.
North Korea said on Wednesday it had successfully conducted the test of a miniaturized hydrogen nuclear bomb, drawing threats of further sanctions even though the United States and weapons experts voiced doubts the device was as advanced as the isolated nation claimed.
Abe was one of the first world leaders to condemn Pyongyang's actions, saying that Japan "absolutely cannot tolerate" nuclear testing by the isolated Communist country.