North Korea warned on Sunday that the United States will face a grave situation if it continues to pursue its hostile policy toward Pyongyang's nuclear program.

Iran PressAsia: The statement, attributed to Kwon Jong Gun, head of the Foreign Ministry's department of US affairs, comes as the Biden administration is set to unveil a new strategy to deal with the isolated Asian nation.

The statement said President Biden made a "big blunder" when he called North Korea's and Iran's nuclear programs a security threat during a speech before a joint session of Congress on Wednesday. Biden said he would work with allies to address the threats with "diplomacy and stern deterrence."

The statement, published on a government news site, warned that North Korea could respond with "corresponding measures."

On Friday, White House press secretary Jen Psaki said the administration had completed a "thorough, rigorous and inclusive" policy review of North Korea. She said the administration's goal is aimed at completely denuclearizing the Korean Peninsula — something she noted the past four administrations had not achieved. The administration will not focus on achieving a grand bargain or rely on strategic patience, she said.