As Japanese nationalism is fueled by friction with neighbors over territories and World War II legacy issues, hostile demonstrations against the country's Korean residents are gathering steam, raising concerns among political leaders and setting off soul-searching among Japan's largely homogeneous population. While attendance at the rallies is small and such extreme actions are far from entering the mainstream of Japanese politics, the demonstrations of nationalist activists using hate speech and intimidation have grown in size and frequency in recent months. Anti-Korea sentiment in Japan grew right after the 2002 FIFA World Cup. Korea went to the semi-finals, while Japan remained in quarter-finals. Anti-Korea sentiment also grew in March 2009, when Kim Yuna won against Asada Mao. This kind of supports the idea that anti-Korean sentiment in Japan is caused from a sense of inferiority.