Japan protests Russian drills on disputed islands
File photo shows a Japanese high school student praying at the grave of a former Japanese islander on Iturup island in the disputed Kurils in 2007 - by Shingo Ito
Moscow launched drills Tuesday on the long-contested islands, which are located off Russia's far eastern coast and just north of Japan.
The exercises are "extremely regrettable," said a foreign ministry spokesman.
"We have filed a stern protest with the Russian embassy," he added.
Responding to questions about the drills, Japanese Prime Minister Shinzo Abe told reporters earlier in the day that "our country, for its part, can't accept this at all".
The exercises came after Russia scrapped a meeting with a Japanese minister in response to a new round of sanctions by Tokyo against senior figures involved in the annexation of Ukraine's Crimean peninsula.
The meeting, originally scheduled for late August, was expected to focus on the simmering territorial dispute. Japan is a close ally of the United States, which has been piling pressure on Russia over its involvement in Ukraine.
In Washington, State Department spokeswoman Marie Harf declined comment on the Russian exercises but said: "The United States recognizes Japanese sovereignty over these islands."
The longtime US stance marks a contrast to the myriad other territorial disputes in Asia, in which Washington generally says that it takes no position on islands' ultimate sovereignty but is seeking calm.
Soviet troops seized the islands just after Japan surrendered in World War II, with the seven-decade dispute hampering trade and keeping Moscow and Tokyo from signing a post-war peace treaty.
Both the Kremlin and Abe had hoped to start mending relations in order to revive trade, with Japan seeking broader access to Russia's plentiful oil and natural gas supplies.
Russian President Vladimir Putin hosted Abe in April 2013 for the two sides' first formal summit in Moscow in a decade.
The leaders agreed to set in motion a series of high-level talks about Tokyo's claim to the southern Kuril chain that it still refers to as the Northern Territories.