North Korea on Monday condemned the US attacks against three of Iran's key nuclear sites, accusing the administration of President Donald Trump of violating Iran's territorial integrity and the United Nations Charter.

"The just international community should raise the voice of unanimous censure and rejection against the US and Israel's confrontational acts," said a spokesperson for North Korea's Foreign Ministry, according to the Yonhap news agency.

Pyongyang had previously described Israeli missile attacks against Iran as a "hideous act."

Nuclear-armed North Korea has maintained friendly ties with Iran.

For decades, Tehran and Pyongyang have been suspected of military cooperation, including in developing ballistic missiles that Iranian scientists have reportedly since enhanced.

Around 20 years ago, North Korea began dispatching engineers with specialist deep tunneling expertise.

Since the three-year Korean War began in 1950, North Korea has concealed much of its own key military capabilities in underground bases.

The regime will be keen to determine the effectiveness of its underground bunkers, while looking at the impact of the GBU-57........

© Deutsche Welle