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

South Korea 's Yonhap News Agency said North Korea might be using a vertical cold-launch system to fire the missiles. The system, which is commonly associated with submarine- and ship-based weapons, ejects a missile from its container before the missile ignites midair.

North Korean leader Kim Jong Un has inspected a facility that produces nuclear material and called for bolstering the country’s nuclear capability, state media reported Wednesday, as it ramps up pressure on the United States following the inauguration of President Donald Trump.

North Korea carried out missile tests on Saturday in the latest act of defiance from the hermit kingdom, which has been ramping up its military activity in recent months

Test overseen by Kim Jong Un to enhance Pyongyang’s defense capabilities, according to state media - Anadolu Ajansı

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.

North Korea has test-fired sea-to-surface strategic guided cruise missiles, state news agency KCNA reported Sunday, adding that the weapons precisely hit their targets.The war deterrence means

The weapons hit their marks, with 'no negative impact on the security of neighboring countries,' according to KCNA report

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.

North Korea announced it had performed a test of its cruise missile system on Saturday. It was the communist country’s fourth known missile launch since November and the second in less than a week since President Donald Trump’s inauguration.