A new type of a tactical guided missile was launched from the North Korean town of Hamju, South Hamgyong Province, in this March 26 file photo released by the Korean Central News Agency. North Korea said Sunday that U.S. President Joe Biden made a "big blunder" after he called Pyongyang's nuclear program a serious threat, warning the U.S. will face a "worse and worse crisis beyond control." Yonhap

North Korea said Sunday that U.S. President Joe Biden made a "big blunder" after he called Pyongyang's nuclear program a serious threat, warning the U.S. will face a "worse and worse crisis beyond control."

Kwon Jong-gun, director general of the Department of U.S. Affairs of the Foreign Ministry, made the remarks after Biden pledged in his first congressional address last week to work with allies to address "serious threats" from the North and Iran through diplomacy and stern deterrence.

"It is certain that the U.S. chief executive made a big blunder in the light of the present-day viewpoint," Kwon said. "Now that what the keynote of the U.S. new DPRK policy has become clear, we will be compelled to press for corresponding measures, and with time the U.S."

DPRK stands for the North's official name, Democratic People's Republic of Korea.

The official also said that the U.S. "will face worse and worse crisis beyond control in the near future if it is set to approach the DPRK-U.S. ties, still holding on the outdated policy from Cold War-minded perspective and viewpoint."