Concrete progress in negotiations with Moscow over a World War II-era territorial dispute are indispensable, Japan's foreign minister said. "So far as talks on concluding a peace treaty are concerned ... we can see no change," said Foreign Minister Masahiko Komura. "We hope in tomorrow's meeting our ministers ... will at least start a process of negotiating a peace treaty," he added of talks Monday with his Russian counterpart Sergei Lavrov. Moscow and Tokyo have been at odds for more than six decades over ownership of four Kuril islands -- which are known in Japan as the Northern Territories and lie within sight of Japan's northeastern coast.