Also on Monday, the United Nations nominated South Korean Foreign Minister Ban Ki-moon to succeed Kofi Annan as U.N. secretary-general.
"The window for dialogue is always open, " South Korean Foreign Minister Yun Byung-se said Friday following his meeting with Mr. Kerry.
Boucher's comments came after a meeting Monday between U.S. Secretary of State Condoleezza Rice and South Korean Foreign Minister Ban Ki-moon.
Okada made the rare apology during a joint news conference with South Korean Foreign Minister Yu Myung-hwan, Korean state-run media reported.
South Korean Foreign Minister Yun Byung-se will meet US Secretary of State John Kerry on later on Tuesday to discuss North Korea.
South Korean Foreign Minister Kim Sung-Hwan accused the North of a "clear breach of the UN resolution that prohibits any launch using ballistic missile technology".
The visit to Japan would have been the first by the South Korean foreign minister since the new administration of Park Geun-hye took power earlier this year.
The South Korean foreign minister is in Washington this week.
South Korean Foreign Minister Song Min-soon said the results of the summit were anticipated and cautioned that the country should be prepared for a protracted standoff, noting that other hostages in Afghanistan had been held an average of 35 days.
The situation has become so prickly that South Korea's Foreign Ministry summoned Japan's ambassador Thursday to lodge a formal complaint about that comment three days after the South Korean foreign minister canceled a planned trip to Tokyo over the weekend war-memorial visits.
The situation has become so prickly that South Korea's foreign ministry summoned Japan's ambassador Thursday to lodge a formal complaint about that comment three days after the South Korean foreign minister canceled a planned trip to Tokyo over the weekend war memorial visits.
In 1983, four key South Korean cabinet ministers, including Foreign Minister Lee Bum-suk, were killed in a bomb blast in Rangoon.
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