Key facts
- Russian President Vladimir Putin visited the disputed Kuril Islands, which Japan calls the Northern Territories.
- Japan lodged a diplomatic protest and called the visit unacceptable.
- Russia maintains the islands are an integral part of the Russian Federation.
- Japan has not yet announced any countermeasures to Putin's visit.
- Japan's inaction is linked to uncertainty over U.S. policy and fears of Russian military cooperation with China and North Korea.
