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Frictions also have flared recently over another set of disputed islands controlled by South Korea.

South Korean President Lee Myung-bak visited the islands in the East Sea/Sea of Japan, called Takeshima in Japanese and Dokdo in Korean, earlier this month. His visit was seen by many as an attempt to play up anti-Japan sentiment ahead of elections later this year.

In the latest move to reinforce its territorial claim, South Korea unveiled on Sunday a 47-inch-tall monument in the disputed islets, emblazoned in Korean with “Dokdo” in front, “Republic of Korea” on the back and President Lee Myung-bak’s name on the side.

The Japanese group that landed on Uotsuri Island on Sunday was among dozens of conservative lawmakers and activists who were visiting waters off the disputed islands over the weekend.

“Four days ago there was an illegal landing of Chinese people on the island — as such we need to solidly reaffirm our own territory,” said Koichi Mukoyama, a national lawmaker who was among seven conservative parliamentarians aboard a boat in the flotilla of some 20 vessels that traveled to the islands.

The lawmakers refrained from landing on Uotsuri after the government last week rejected their application to visit.

Last week’s visit by the Chinese activists raised calls by critics of Prime Minister Yoshihiko Noda’s government to take stronger action to protect the islands. Some lawmakers are urging that Japan’s military be called on to protect the territory.

Japan says it has controlled the five main islands for more than 100 years. It has been trying to place four that are privately held under state ownership to bolster its territorial claim.

Associated Press writer Elaine Kurtenbach in Tokyo contributed to this report.