Vladimir Putin’s unprecedented visit to the disputed southern Kuril Islands is among a broader joint push by Beijing and Moscow to pressure Japan over a range of grievances, including sanctions on Russia and the Taiwan issue, experts say.The Russian president’s symbolic visit on Thursday to the far east volcanic archipelago north of Japan’s Hokkaido – which Japan calls the Northern Territories – was days ahead of the anniversary on Saturday of Japan’s surrender in World War II.It is Putin’s first visit to the islands as president. In 2010, then-president Dmitry Medvedev became the first Russian leader to visit the disputed territory that the Soviet Union took control of during the final days of the second world war.02:27Japan protests against Russia’s Vladimir Putin’s visit to disputed Kuril IslandsPutin’s trip came after he personally observed the final phase of major Pacific Fleet exercises off Sakhalin, north of the Kurils.“I think it’s a comprehensive, across-the-board effort to put pressure [on Japan] and make it uncomfortable,” said Li Lifan, a Russia and Central Asia specialist at the Shanghai Academy of Social Sciences.“It also serves as a warning to Japan not to visit Yasukuni Shrine on the war anniversary on Saturday.”Yasukuni Shrine was built in the 19th century to memorialise the country’s military dead, but is controversial because it commemorates convicted Japanese war criminals, including Hideki Tojo, Seishiro Itagaki, Heitaro Kimura and Koki Hirota.Japanese Prime Minister Sanae Takaichi visited the site annually before taking the country’s top office in October but she is expected to skip the visit this Saturday, according to The Japan Times.