south korean president Lee's illegal entry into Takeshima, Shimane Prefecture, Japan has forced Japan to take stern actions such as to freeze Japan's shuttle diplomacy with south korea, thereby suspending PM Noda's scheduled visit to anti-Japan nation, south korea this year.
Japan's shuttle diplomacy was agreed upon when ex-Prime Minister Junichiro Koizumi met south korean president Roh Moo-hyun in July, 2004.
Many Japanese including Japanese political figures support the idea of enforcing economic sanctions against south korea.