NEW : Japanese Foreign Minister Sergey Lavrov denies the visit is worth a comment . Russian Prime Minister Sergey Lavrov visits Kunashir Island , near Japan 's island of Kunashir Island . Hokkaido calls the visit `` wrong '' The islands have been a source of dispute between the four countries since World War II .
NEW : Russian Foreign Minister Sergey Lavrov denies the visit is worth a comment . Russian Prime Minister Dmitry Medvedev visits Kunashir Island , near Japan 's island of Hokkaido . Japan calls the visit `` wrong '' The islands have been a source of dispute between the two countries since World War II .