US President Donald Trump on Wednesday said the former national security advisor John Bolton was not aligned with his administration's priorities, saying Bolton made some mistakes, including offending North Korea's leader Kim Jong-un by demanding that he follow a "Libyan model" and hand over all his nuclear weapons.
Hours later, North Korea fired a new round of short-range projectiles, Reuters said.
The North's Korean Central News Agency said Kim, accompanied by top military and ruling Workers' Party officials, supervised the two rounds of test-firings at an unidentified place on Tuesday.
"What remains to be done is running fire test which is most vivid character in terms of the power of multiple rocket launcher", KCNA said.
While analysts said North Korea conducts weapons tests for a range of purposes, including technical development and reassurance for the defence establishment, Tuesday's launches appeared to have been timed to send a message to Washington regarding what may happen if the USA does not come to North Korea with realistic proposals.
Numerous latest missiles launched by North Korea appear to be new types created to evade interception by US, South Korean and Japanese missile-defense systems.
North Korea has so far this year taken a series of positive steps, and has asked the United States to meet them half way, he said. "More detailed analysis is needed to determine the exact specifications", JCS spokesman Kim Joon-rak said.
He says he doesn't believe short-range missiles violate any agreements.
If the proposals don't satisfy North Korea, dealings between the two countries may come to an end, First Vice Foreign Minister Choe Son Hui said.
"The timing could be convenient for US diplomacy with North Korea", said Leif-Eric Easley, a professor at Seoul's Ewha University.
Little progress has been made in getting Kim to give up his weapons programs, but Trump has repeatedly pointed to North Korea's freeze in nuclear and long-range missile tests since 2017 as evidence of the success of his efforts.
Pyongyang said on Monday that it was willing to restart nuclear talks with the United States in late September but warned that dealings between the sides could end unless Washington takes a fresh approach.
Speaking after Bolton's departure, Pompeo said there were "many times" that they had disagreed, but countries should not expect changes in approach.
Kim Jong Un walks with President Donald Trump north of the Military Demarcation Line that divides North and South Korea, in the Joint Security Area (JSA) in the Demilitarised zone on June 30.
Trump and Kim agreed then to restart working-level negotiations for denuclearization talks that have been stalled since an unsuccessful second summit between Trump and Kim in Hanoi in February.