A huge military parade has taken place in Kim Jong-Un's hermit state today in which massive missiles were driven around the streets- prompting tough talk from the British Foreign Secretary.
International tensions have heightened over the country's nuclear weapons programme in the face of fierce American criticism of the Pyongyang regime.
Now, there is an "armada" of US naval ships in the Korean Peninsula while North Korea said it will fight "all out war" if necessary.
Mr Johnson said the situation needed to be looked at carefully while China, the US and North Korea have all used the word "war".
He said: "We have been here before but continue to monitor the situation carefully.
"We stand alongside our international partners in making clear that North Korea must adhere to UN resolutions designed to secure peace and stability in the region and stop its pursuit of nuclear weapons."
Boris Johnson has ordered North Korea to end its nuclear testing North Korea May Be Preparing a Nuclear Test for Kim Il-Sung’s Birthday Fri, April 14, 2017
North Korea has begun preparing festivities for the 'Day of the Sun,' a holiday celebrating communist leader Kim Il-Sung
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Military officers visit the birthplace of North Korean founder Kim Il Sung, a day before the 105th anniversary of his birth, in Mangyongdae, just outside Pyongyang
Kim Jong Un had ballistic missiles paraded around Pyongyang today
Kim Jong Un put on a massive show of strength with a military parade in the country's capital which highlighted the rogue state's intercontinental ballistic missiles on Saturday.
The display, which celebrated the 105th anniversary of the birth of his late grandfather Kim Il Sung, saw the regime intensify its rhetoric against the US.
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Choe Ryong Hae, widely regarded as the secretive state's number two leading official, accused US President Donald Trump of "creating a war situation" on the Korean Peninsula by sending American forces to the region.
He said: "We will respond to an all-out war with an all-out war and a nuclear war with our style of a nuclear attack."
The parade came amid growing international concern that North Korea could be preparing for a sixth nuclear test or a major missile launch, possibly its first flight test of an ICBM capable of reaching America.
Mr Trump has warned that North Korea is "looking for trouble" and ordered an aircraft carrier group to the area to highlight American concern.
China has expressed fears that "conflict could break out at any moment", and that such a situation would bring no winners.
Liberal Democrat leader Tim Farron said Prime Minister Theresa May and Mr Johnson needed to use what influence they had with Mr Trump to tell him that "aircraft carrier diplomacy" was not the answer.
"If Theresa May and Boris Johnson really do have any influence with their great friend in the White House they need to make clear that aircraft carrier diplomacy is not what the world needs.
"Where is Britain's new global influence that Theresa May was boasting about?
"On Syria, Russia and now North Korea, the British Government has no influence, cut off from our partners in Europe thanks to their hard Brexit."