Concluding a peace treaty with Japan would involve Moscow examining how it could be affected by Tokyo's security commitments to its allies, Russian President Vladimir Putin said on Saturday.
Russia and Japan never formally ended their hostilities after World War II because of a dispute over a chain of islands in the Pacific.
Putin was speaking at the end of an Asia-Pacific Economic Cooperation Summit in Vietnam at which he said he discussed talks on the treaty with Prime Minister Shinzo Abe.