Tokyo and Seoul struck a conciliatory note on Monday on the anniversary of the end of World War II, with South Korea's president calling for a "future-oriented" relationship and Japan's prime minister denouncing the "horrors of war".

Prime Minister Shinzo Abe sent a ritual donation to a controversial Tokyo war shrine but again avoided visiting it, in an apparent nod to China and South Korea.

South Korean President Park Geun-Hye, meanwhile, called for a "future-oriented" relationship with Tokyo even as  a group of Seoul lawmakers sparked official anger in Japan by visiting islets claimed by both nations.

August 15 is an emotional date in both countries, remembered in Japan as the day in 1945 when wartime Emperor Hirohito announced the surrender. In South Korea it is marked as the day Japan's harsh 35-year occupation of the Korean peninsula came to an end.

China, which was partially occupied by Japan from the early 1930s to 1945, marks the end of the war on September 3. 
A frequent flashpoint for nationalist tensions is Yasukuni Shrine, which honours millions of war dead including senior military and political figures convicted of war crimes after the conflict's end.

Abe visited in December 2013, sparking fury in Beijing and Seoul and earning a rare diplomatic rebuke from close ally the United States.

He has since refrained and reactions by China and South Korea to visits by cabinet ministers and lawmakers, while still critical, have become less intense.

Separately, Abe and Emperor Akihito both reiterated Japan's commitment to peace at an official ceremony to commemorate the war dead.

"We shall never again repeat the horrors of war," Abe said.

- 'Extremely regrettable' -
Akihito expressed similar sentiments.

"Reflecting on our past and bearing in mind the feelings of deep remorse, I earnestly hope that the ravages of war will never be repeated," he said.

Park, in her nationally televised speech in Seoul, stressed the need to look forward.

"We should newly define relations with Japan to forge future-oriented ties," she said.

But her remarks coincided with the visit by 10 lawmakers to the Dokdo islets where they met South Korean security personnel based there.

South Korea has long controlled the islets in the Sea of Japan (East Sea) which are known in Japanese as Takeshima, but Tokyo has never renounced its claim.
We absolutely cannot accept this," top government spokesman Yoshihide Suga told reporters in Tokyo, calling it "extremely regrettable".

Abe and Park are scheduled to visit China early next month for a Group of 20 summit hosted by President Xi Jinping, while Japan is due to host a trilateral leaders' meeting later this year.

Abe sent the offering to Yasukuni as president of the ruling Liberal Democratic Party rather than as prime minister in an apparent attempt to lessen criticism. 

A total of 67 members of Japan's parliament -- 59 from Abe's ruling LDP -- visited the shrine en masse in the morning.

Tomomi Inada, Abe's hawkish new defence minister who has been a frequent visitor to Yasukuni in past years, was on an official visit to Djibouti.

But two members of Abe's cabinet showed up at the shrine in the afternoon.

"I don't think the way a country commemorates people who died for their country should be a diplomatic issue," Sanae Takaichi, internal affairs minister, told reporters.