North Korea has not made secret its desire to boost its military power, while a US naval strike group is now heading to waters off the Korean Peninsula in a show of force, following high-profile USA military attacks this month on Syria and the Islamic State in a remote part of Afghanistan.
Han made his remarks to an Associated Press reporter, one of more than 100 foreign journalists who flew to Pyongyang on an Air China flight to witness massive celebrations to mark the 105th anniversary Saturday of the birth of Kim Il-Sung, Kim Jong-Un's grandfather and founder of the North Korean state.
This image captured from footage aired by North Korea's state TV broadcaster on April 15, 2017, shows a military parade held in Pyongyang to mark the 105th birthday of late founder Kim Il-sung.
"North Korea is a problem", Trump said April 13.
If North Korea goes ahead with a further nuclear test today or in the next few days, then an worldwide response is necessary, but it must not involve military action.
According to Han, Trump is only, "making trouble" with his "aggressive" tweets. Washington and Seoul have emphasised that intercepting the North's advanced development of inter-continental ballistic missiles was the real objective behind the new system.
Last year, North Korea conducted two nuclear tests. He added, "The last thing we want to see is a nuclear North Korea that threatens the coast of the United States or, for that matter, any other country or any other set of human beings".
Morell stressed that the North's nuclear capabilities were a current threat.
Pyongyang has also expressed anger over the ongoing annual spring military exercises the US holds with South Korea, which it considers a rehearsal for invasion.
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Meanwhile, North Korea's staunchest ally, China, is freaking out.
In a show of force a few days ago, the USA dispatched what President Donald Trump called an "armada" of ships, including an aircraft carrier, into waters off the Korean Peninsula.
When asked if North Korea would use nuclear weapons if they felt they were being attacked, Ryol replied "of course".
North Korean authorities claim that they will attack the United States first if they believe they are under nuclear threat. "Now we are comparing Trump's policy toward the DPRK with the former administration's and we have concluded that it's becoming more vicious and more aggressive".
South Korean analysts speculated that the US would be deterred from its own pre-emptive strike against the North by the presence in the South of large numbers of USA citizens.
Amid the rhetoric from all sides, no information has emerged to challenge the news reports from earlier this week: North Korea appears to have placed a device in a tunnel at its nuclear test site that could be detonated Saturday or even sooner.
"All the brigandish provocative moves of the U.S.in the political, economic and military fields pursuant to its hostile policy toward the DPRK will thoroughly be foiled through the toughest counteraction of the army and people of the DPRK", the KCNA state news agency said, citing a spokesman for the General Staff of the Korean People's Army.
Trump is only the second USA president to have an official presidential Twitter account, and the first was carefully curated by Barack Obama's staff. The North also past year launched a long-range rocket that put a satellite into orbit, which Washington, Seoul and others saw as a banned test of missile technology.