Now even elementary schoolchildren in Japan are to be taught Tokyo's flimsy colonial claim to Korea's Dokdo islets.
Japanese Prime Minister Shinzo Abe told the Diet on Wednesday it is "very important" that Japanese children can explain their country's position when engaging in debates abroad about Dokdo and other territorial issues.
Education Minister Hakubun Shimomura then pledged to "pursue" ways of bolstering education about Tokyo's various sovereignty claims over Dokdo, the Senkaku or Diaoyu Islands and others in elementary schools.
The Japanese Education Ministry recently published a regular revision of teaching guidelines for secondary schools that claim Dokdo is Japanese territory and instructed regional educational committees to adhere to them. The guidelines, which are not legally binding, are used by publishers of school textbooks and teachers.
Shimomura said he also wants to stipulate in legally binding teaching manuals that Dokdo belong to Japan.