North Korea test-fired two strategic cruise missiles from a submarine on Sunday, as reported by state news agency KCNA on Monday.

According to a statement shared by KCNA, “the Central Military Commission of the Workers’ Party of Korea expressed satisfaction over the results of the launching drill.”

North Korea’s decision to test-fire the missiles comes in the wake of South Korea and the U.S. conducting their combined special operations training event, ‘Teak Knife.’

“It’s very regretful that North Korea is using our regular, defensive drills as a pretext for provocation,” said Koo Byoung-sam, spokesperson for South Korea’s Unification Ministry.

“I hope North Korea realizes that there is nothing they can earn from escalating tensions on the Korean peninsula,” he added.