SEOUL/TOKYO (Reuters) – A North Korean state agency threatened on Thursday to use nuclear weapons to “sink” Japan and reduce the United States to “ashes and darkness” for supporting a U.N. Security Council resolution and sanctions over its latest nuclear test.

The Korea Asia-Pacific Peace Committee, which handles the North’s external ties and propaganda, also called for the breakup of the Security Council, which it called “a tool of evil” made up of “money-bribed” countries that move at the order of the United States.

“The four islands of the archipelago should be sunken into the sea by the nuclear bomb of Juche. Japan is no longer needed to exist near us,” the committee said in a statement carried by the North’s official KCNA news agency.

Juche is the North’s ruling ideology that mixes Marxism and an extreme form of go-it-alone nationalism preached by state founder Kim Il Sung, the grandfather of the current leader, Kim Jong Un.

Regional tension has risen markedly since the reclusive North conducted its sixth, and by far its most powerful, nuclear test on Sept. 3, following a series of missile tests, including one that flew over Japan.