Japan will consider crafting a new document to mark the 20th anniversary in October of a joint declaration seeking to promote closer ties with South Korea, government sources have said.

The government is hoping to show that relations between Tokyo and Seoul have been improving and arrangements will begin for a potential visit to Japan by South Korean President Moon Jae-in this year, the sources added Wednesday.

Moon's visit, if it comes to fruition, would boost the likelihood that Prime Minister Shinzo Abe and the South Korean leader will jointly issue a new document.