sentences:  While the North Korea stressed that U.S. efforts to suppress these organizations constituted interference in the internal affairs of Afghanistan, Nigeria, and Iraq, the Iranian leaders, who regarded Sunni Salafi extremism as a direct threat to their own interests, repeatedly accused America of not striving hard enough to eliminate these groups or even seeking to reach an agreement with them.Since the 1980s North Korea has become known as a reliable supplier of arms to other countries including Iran.Weapons sales between North Korea and Iran increased significantly during the Iran-Iraq war.