British Foreign Secretary William Hague has called for calm over the North Korean crisis, despite the "paranoid rhetoric" emanating from Pyongyang.
"We have to be concerned about the danger of miscalculation by the North Korean regime," Mr Hague said.
It was important to stay "firm and united", he said, adding North Korea was trying to justify militarisation by "ramping up" external threats.
North Korea has made a series of direct threats against the US and South Korea.
Since being sanctioned by the UN in March for carrying out a third nuclear test, Pyongyang has threatened nuclear strikes on the US, formally declared war on the South, and pledged to reopen a nuclear reactor in defiance of UN Security Council resolutions.
On Friday, North Korea warned it would not be able to guarantee the safety of embassy staff in the event of a war.
But Mr Hague, speaking to the BBC, said he had not "seen any immediate need to respond to that by moving our diplomats out of there".
He added, however, that Britain would "keep this under close review with our allies and international partners".
Missile test postponed
The foreign secretary said North Korean leaders were making "the wrong choice" between isolation and engagement with the international community, and warned "they will end up leading a broken, friendless country".
But he said there had not been in recent weeks the visible redeployment of ground forces consistent with an invasion plan, nor "a change in what is happening in North Korean society".
"What is going on is what we have often seen throughout history," he said. "This is a regime that has to justify the intense militarisation of their society."
This week, the North reportedly moved at least one missile to its east coast. It has threatened to strike the Pacific island of Guam, where the US has a military base.
But US and South Korean officials have sought to play down fears of a conflict on the Korean peninsula, saying there are no indications Pyongyang is preparing for a large-scale attack.
This weekend the US said it was postponing a planned test of its own Minuteman 3 ballistic missile, saying it was concerned the launch could be misinterpreted by Pyongyang.
A Pentagon official said the US wanted to avoid any "miscalculation" that might result from the test.
The BBC's John Sudworth in Seoul says Pyongyang will likely use the delay to its advantage in propaganda, and say the US has been forced to climb down in the face of resilience from the North Korean army.
The North Korean media are full of images of military preparedness, he adds, intended to rally people behind the leadership.
Many observers say that North Korea's belligerent rhetoric appears intended for a domestic audience and at shoring up the position of Kim Jong-un, who came to power after his father's death in December 2011.