On Thursday, Kim Yo-jong, sister of North Korea's leader Kim Jong-un, denounced international calls for denuclearization, describing the country's nuclear weapons as its "core interests." File Photo Jorge Silva/EPA

June 18 (UPI) -- The powerful sister of North Korean leader Kim Jong-un on Thursday denounced international calls for denuclearization, describing the country's nuclear weapons as its "core interests" and denuclearization as a "line of no retreat that can never be crossed," Pyongyang's state media reported.

In a statement carried by the Korean Central News Agency (KCNA), Kim Yo-jong criticized the United States and its allies for making what she called "anachronistic" demands for North Korea's denuclearization.

Kim's remarks came in response to a joint statement issued by leaders of the Group of Seven (G7) nations at their summit in Evian-les-Bains, France, on Wednesday, which reaffirmed their commitment to the "complete denuclearization" of North Korea in line with UN Security Council resolutions.

Dismissing the G7's demand outright, she said denuclearization was "an irreversibly finalized agenda" that "can never be realized."