It appears that an old territorial dispute over the Kurils, an island chain north of Hokkaido claimed by both and administered by Russia, is flaring up between Russia and Japan now that a Russian ship has fired on a Japanese fishing boat and killed one of the men on board.  The Japanese claim that the incident took place in their waters and are demanding an apology.  It is most unlikely that this will lead to anything else, but it certainly badly sours relations between the two countries and may have some indirect impact on future cooperation on North Korea.