The United States flew a B-1B supersonic bomber over South Korea in part of a massive combined aerial exercise involving hundreds of warplanes. Picture: South Korea Defense Ministry via AP

Seoul — North Korea says a nuclear war on the Korean Peninsula has become a matter of when, not if, as it continued to criticise a massive joint military exercise between the United States and South Korea.

North Korea also claimed high-ranked US officials, including CIA Director Mike Pompeo, have confirmed American intent for war with "bellicose remarks."

Read more: Is war coming to North Korea?

Pompeo said Saturday that US intelligence agencies believe North Korean leader Kim Jong Un doesn't have a good idea about how tenuous his situation is domestically and internationally. A North Korean Foreign Ministry spokesperson said Pompeo provoked the country by "impudently criticising our supreme leadership."

Also read: North Korean regime will be 'utterly destroyed' in case of war - US

The comments were reported after the United States flew a B-1B supersonic bomber over South Korea on Wednesday as part of an exercise involving hundreds of warplanes.

Associated Press