North Korean animators are believed to have worked on programs produced by Japanese and U.S. studios despite sanctions against doing business with the country, a research report released Monday said. U.S.-based website 38 North, which covers events related to North Korea, said that documents accessed online showed the programs worked on included “Dahliya In Bloom,” a Japanese animation series due to air from July and a third season of “Invincible” produced by California-based Skybound Entertainment and to be broadcast on Amazon Prime. The report said there is no evidence to indicate the studio…