North Korea test fires underwater-to-surface strategic cruise missile: Report

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."

The underwater-to-surface strategic cruise missiles travelled 1,500 kilometres and flew between 7,507 and 7,511 seconds before hitting their targets, KCNA reported.

In a separate KCNA report on Sunday, North Korea's foreign ministry vowed the "toughest counteraction" against the US as long as Washington "refuses" Pyongyang's sovereignty.

The military alliance and joint drills between South Korea and the US were to blame for the growing tensions in the region, the ministry said in a statement carried by KCNA.

The statement came as US President Donald Trump said during an interview on Thursday that he would reach out to Kim again after the two developed a working relationship in Trump's first term.

North Korea's war deterrence means were being "perfected more thoroughly," Kim was quoted as saying, while the leader also vowed to continue efforts to strengthen its military.

"Kim Jong Un affirmed that the DPRK will always make strenuous efforts to perform its important mission and duty for defending sustainable and lasting peace and stability on the basis of more powerfully developed military muscle in the future."

The DPRK stands for North Korea's official name, the Democratic People's Republic of Korea.

The report said the missile test was part of plans to build national defence capabilities against potential enemies in line with changing regional safety circumstances.

Earlier this month, North Korean state media also reported that Kim oversaw a successful test of a new intermediate-range hypersonic ballistic missile (IRBM).