North Korea says it tested two “strategic cruise missiles” from a submarine for the first time on Sunday in a demonstration to the U.S. and South Korea of the country’s “diverse” nuclear strike methods, as the allies kick off large-scale joint drills.

State media said the “underwater launching drill” off the east coast serves as “proof of the regular operating posture of [our] nuclear war deterrent means in diverse spaces.” The report did not mention the presence of leader Kim Jong Un at the test. 

The Rodong Sinmun reportalso stated the test “clearly expressed the invariable position of the