North Korea says it tested a cruise missile system, its third known weapons display this year, and vowed “the toughest” response to what it called the escalation of U.S.

North Korea test-fired strategic cruise missiles Saturday as the Lunar New Year holidays began in South Korea, North’s state-run Korean Central News Agency (KCNA) reported early Sunday.

North Korea conducted a strategic cruise missile test on Saturday, state media KCNA reported on Sunday. The country's leader Kim Jong Un oversaw the test, according to the report, which described it as a test-fire of an "important weapon system.