Thursday's missile firing came after North Korea carried out a military drill and fired multiple projectiles on Saturday, with at least one believed to be a short-range missile.
With Thursday's launch, said Hong Min, a senior researcher at the state-run Korea Institute for National Unification, "North Korea is sending a clear message that it will not be satisfied with humanitarian aid" being considered by Seoul.
Following the collapse of the Trump-Kim meeting, the North had demanded the South proceed with inter-Korean economic projects held back by US-led sanctions against the North.
But while some experts say last week's launch appeared to have involved a short-range ballistic missile, that has not yet been confirmed by Seoul or Washington.
By firing weapons that directly threaten South Korea but not the USA mainland or its Pacific territories, North Korea also appears to be testing how far Washington will tolerate its bellicosity without actually causing the nuclear negotiations to collapse, Cha said.
Moon's office earlier said the North Korean launches were "very concerning" and detrimental to efforts to improve inter-Korean ties and ease military tensions on the Korean Peninsula. "They were smaller missiles, short-range missiles - nobody's happy about it", Trump told reporters.
North Korea's Rodong Sinmun newspaper, the mouthpiece of the ruling party, devoted its entire front page and half of page two to the launch on Friday, with 16 pictures, the main one of Kim watching the launch from a camouflaged shelter.
The South's Joint Chiefs of Staff didn't immediately release details about what type of projectile the North fired and said it was still analyzing the launch.
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Seoul's foreign ministry spokesperson Kim In-chul told reporters that the two sides will review the latest developments related to the North, and ways to make progress on denuclearization and lasting peace on the Peninsula.
In a statement Thursday, Pentagon spokesman Lt. Col. Dave Eastburn said the North "flight-tested multiple ballistic missiles" and they flew to distances "in excess of 300 km before impacting in the ocean".
However, in February their second summit broke down, reportedly after North Korea demanded that all USA sanctions were lifted before they can move forward.
In its April 2017 military parade, North Korea displayed a truck-based TEL and a 16-wheel CASIC TEL, armed, respectively, with launch tubes for a medium-range and an intercontinental range solid-fuel ballistic missile. He also knows that I am with him and does not want to break his promise to me.
Kim Jong Un's father Kim Jong Il was also a basketball fan and requested that the US invite Michael Jordan to North Korea during talks in 2000, but Jordan declined. The act-which the Air Force argued was "not a response or reaction to world events or regional tensions"-was met with comparatively little global reaction, as was a nuclear-capable Trident II D-5 submarine-launched ballistic missile test hours later that took place off the Florida coast and landed across the waters of the Atlantic near Namibia".
The missiles were short-range and the launches do not mean Kim has made a decision to end his self-imposed moratorium on testing long-range missiles that could reach the United States mainland.
But the North appeared to have refrained from using weapons that directly threaten the United States, Moon said.