Pyongyang criticises G7 for its recent communique calling for North Korea's denuclearisation.
North Korean leader says gaining reconnaissance technology was a "primary task to be indispensably fulfilled" because of what he describes as threats and aggression from US and South Korea.
Seoul says the military remains decisive on battle posture and monitors "the enemy's movements in preparation for potential provocations" on borders.
North Korea says the development of its new solid-fuel long-range missile would "radically promote" its nuclear counterattack capability. But is the missile the game-changer Pyongyang claims it to be?
Seoul says the missile was launched on a high angle near Pyongyang and fell in the waters between the Korean Peninsula and Japan following a 1,000-kilometer (620-mile) flight.
Kim ordered that the country's deterrence capabilities be strengthened with "increasing speed" and in a "more practical and offensive" manner.
Test proved "reliability" of weapon system and its "fatal attack ability," state media KCNA reports.
Three-nation exercise was arranged to improve the three allied countries’ capacities to respond to underwater security threats posed by North Korea’s advancing submarine-launched ballistic missiles.
Kim Jong-un made the remarks as he inspected the country's nuclear weapons programme, including new tactical nuclear weapons and technology for mounting warheads on ballistic missiles, state media reported.
South Korea says the missiles flew cross-country after being fired from a western inland area south of the North Korean capital of Pyongyang.
Drone system is designed to unleash "radioactive tsunami" in enemy waters and destroy naval striker groups and major operational ports, state media say.
Seoul and Washington have ramped up defence cooperation in the face of growing military and nuclear threats from Pyongyang, which has conducted a series of banned weapons tests in recent months.
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