Japan has recalled its ambassador to Korea to protest President Lee Myung-Bak's visit to a group of islands claimed by both countries.
Japanese Foreign Minister Koichiro Gemba said Friday that Lee's visit was "utterly unacceptable," and would have a "strong impact" on Korean-Japan relations.
"In protest, we are temporarily pulling out Ambassador Masatoshi Muto from the Japanese Embassy in Korea. Additionally, we passed the message to the Korean ambassador that we were given no choice but to take suitable measures against it."
The two countries share strong trade and tourism ties and work together on numerous foreign policy issues of mutual concern. But a series of territorial and historical issues have also plagued the relationship.
Some information for this report was provided by AP, AFP and Reuters.