North Korea confirmed Wednesday it has resumed plutonium production and said it has no plans to stop nuclear tests as long as perceived threats from the United States continue.

"We have reprocessed spent nuclear fuel rods removed from a graphite-moderated reactor," the Atomic Energy Institute, which holds jurisdiction over North Korea's main nuclear facilities at its Nyongbyon complex, said in a written interview with Kyodo News.

In its first-ever response to foreign media questions, the institute also said North Korea has been producing highly enriched uranium necessary for nuclear arms and power "as scheduled."