North Korea's foreign ministry vowed the "toughest counteraction" against the United States as long as Washington "refuses" the country's sovereignty.

North Korea has test-fired sea-to-surface strategic cruise guided missiles, the North's state media reported Sunday, quoting Kim as saying that Pyongyang's deterrence means are being perfected.

The DPRK stands for North Korea's official name, the Democratic People's Republic of Korea. In a statement later in the day, South Korea's Joint Chiefs of Staff said North Korea fired multiple cruise missiles from inland areas towards waters off the west coast at around 4 p.m. (0700 GMT) on Saturday.

Kim Jong Un oversaw the missile test — the first since US President Donald Trump returned to the White House. Trump has said he would reach out to Kim in his second term.

North Korea said Sunday 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.-South Korean military drills that target the North.

The country's leader, Mr Kim Jong Un, oversaw the test of strategic cruise missiles that travelled over 1,500km. Read more at straitstimes.com.

North Korea test-fired strategic cruise missiles on Saturday the official Korean Central News Agency reported, marking a third launch this month as Donald Trump returned to power in the US.

North Korea has tested sea-to-surface strategic cruise guided missiles, Pyongyang's state media reported on Sunday. State-controlled KCNA news agency quoted the country's Missile Administration as stating the test-fire,