“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 Korea Asia-Pacific Peace Committee said in a statement published by the North’s KCNA news agency.

The Korea Asia-Pacific Peace Committee is the North’s official propaganda arm and is also notionally responsible for managing ties with international partners. Juche, which translates as “self-reliance,” is Pyongyang’s ruling ideology. It’s a blend of Marxism and hyper-nationalism and is the brainchild of leader Kim Jong Un’s late grandfather, Kim Il Sung, North Korea’s first president who led the country until his death in 1994.