Breaking its silence on South Korea's new liberal Moon Jae-in administration, North Korea said it was "astonishing" that Moon convened an urgent National Security Council (NSC) meeting with "remnants" of the former Park Geun-hye administration following its ballistic missile test Sunday, warning that anyone who challenges the North's dignity won't be afforded "any mercy".
North Korea on Saturday unveiled footage which it claims backs its latest revelation that South Korean and US spy agencies plotted to kill its leader Kim Jong-un using a biochemical substance.
Asked if he was confirming that the North Korean missile launch did have a controlled reentry into the atmosphere, Mattis said Friday: "No, I was not".
Last week Pyongyang launched an intermediate-range missile named the Hwasong-12 its longest-range missile yet, according to analysts.
"We're early in the stages of applying the economic pressure as well as the diplomatic pressure to the regime in North Korea", Tillerson said.
"Our military is closely monitoring signs for additional provocation by the North Korean military and we are keeping a full military readiness", said a statement from the South's Joint Chiefs of Staff.
Kim also dismissed allegations that the Democratic People's Republic of Korea - the country's official name - was behind the recent wave of global cyberattacks as "ridiculous".
That missile travelled about 500 kilometers before crashing into the sea, according to South Korean and USA officials.
Regarding the May 14 launch of the missile, the official Korean Central News Agency claimed: "It also verified the homing feature of the warhead under the worst reentry situation and accurate performance of a detonation system".
Researchers in the US, Russia and Israel have also pointed to a potential North Korean link - but it is notoriously hard to attribute cyberattacks.
The missile landed in the sea near Russian Federation.
The office did not give further details, but Yonhap News Agency said it was not believed to be an intercontinental ballistic missile (ICBM), citing an anonymous source.
"I would like to have a thorough discussion about this at the G7 summit", Mr Abe told reporters after a meeting of the National Security Council.
North Korea's deputy U.N. envoy said on Friday the United States needed to roll back its "hostile policy" toward the country before there could be talks as Washington raised concern that Pyongyang could be producing a chemical used in a nerve agent.
It has been working to develop a nuclear-tipped missile capable of striking the U.S. mainland.