New Delhi, June 8 -- The powerful sister of North Korean leader Kim Jong Un called a U.S. push for the denuclearization of North Korea an "anachronistic dream," saying Sunday the North will steadily expand its nuclear arsenal in the face of U.S.-led threats.

The statement came a day before Chinese President Xi Jinping visits North Korea for talks with Kim Jong Un, in his first visit to the country in seven years.

"The U.S. assertion to backbite the status of the DPRK as a nuclear weapons state has no legally binding force and no one will be bound by the U.S. unilateral rhetoric," said Kim's sister and senior official, Kim Yo Jong, using the abbreviation for North Korea's official name.

She dismissed as "false information" a U.S. announ...