Tokyo's Katsushika Ward intends to postpone a planned visit by its officials to its sister district in Seoul due to the row between Japan and South Korea.
Katsushika Ward and Seoul's Mapo District are sister districts. For over a decade, their officials have paid reciprocal visits to promote friendly ties.
Japanese officials say they are protesting a planned visit by the Russian Prime Minister to an island which is controlled by Russia and claimed by Japan.
Officials in Etorofu Island say Dmitry Medvedev is making arrangements to visit the island via Sakhalin as early as August, and that local officials are making preparations.
The leaders of Japan and China discussed an upcoming state visit Thursday, as the pair met in Osaka. President Xi Jinping is expected to visit Japan next year as a state guest.
Prime Minister Shinzo Abe said, "We'd like to welcome you to Japan as a state guest next year around the time cherry blossoms are in bloom and elevate Japan-china relations to a higher level."
Pope Francis is set to make a four-day trip to Japan this November. It will be the first papal visit to the country since John Paul II came in 1981.
Pope Francis is scheduled to arrive in Tokyo on November 23. The next day, he will visit Nagasaki and Hiroshima. In Nagasaki, he will pray at Urakami Cathedral, which was rebuilt following the atomic bombing of the city in 1945. In Hiroshima, he will commemorate atomic bombing victims at the Peace Memorial Museum.