ULAN BATOR, May 13 (RIA Novosti) - Russia will only sign a formal peace treaty with Japan on terms that meet Moscow's interests, Prime Minister Vladimir Putin said on Wednesday. Russia and Japan have yet to sign a formal treaty ending World War II hostilities, due to their territorial dispute over the four South Kuril Islands, former Japanese territory annexed by the Soviet Union after the war. "This [peace treaty] can only be done in a way that will meet the national interests of the Russian Federation," Putin told reporters. He said the content of a peace treaty would be...