The North Korean leader’s powerful sister has condemned the U.S., Japan and South Korea for pursuing a “nonsensical” and “anachronistic” denuclearization agenda, while reaffirming Pyongyang’s nuclear development as a necessary response to the allies’ “hostile” policies.

In a statement released through the state-owned Korean Central News Agency (KCNA) on Wednesday, Kim Yo Jong slammed the foreign ministers of the three countries for continuing to push for the “complete denuclearization” of the DPRK and labeling it as a “threat.”

Her remarks came in response to a joint statementissued after a meeting on Thursday between U.S. Secretary of State Marco Rubio,