As tensions between Tokyo and Pyongyang mount over a prospective sixth nuclear test by North Korea and a potential pre-emptive attack by the United States, some prefectures have started cutting off funding to North Korean-run schools or placing conditions on their curricula.

Of the 28 prefectures that offer assistance to elementary, junior high and high schools that are associated with North Korea and teach Korean language, culture and North Korean views of Japan's 20th century history, a few are now refusing to continue such support.

Last year, the education ministry issued a directive ordering prefectural governments to take more factors into consideration when deciding whether to fund such schools. For years, many of them have faced pressure to crack down on North Korean-run schools from conservative, right-wing and anti-Korean groups. A politically influential organization representing the victims and families of those abducted by North Korean agents, mostly during the 1970s and 1980s, has also weighed in.