"At the end of the day if the North Koreans evolve into a fully replete nuclear weapons state with ICBMs (intercontinental ballistic missiles) with miniaturised warheads on top then, well, the Chinese view is, the USA will then just have to accept that reality", Mr Rudd said.
"Any nuclear conflict over North Korea today would kill millions of innocent people in the Korean peninsula and beyond, with devastating fallout in China, Japan and elsewhere".
Rep. Keith Ellison (D., Minn.) quickly walked back remarks he made Friday that North Korean dictator Kim Jong-un was acting "more responsible" than President Donald Trump, saying it was "tailor-made for somebody to misuse".
"Trump and Kim must immediately wind down the war of rhetoric, as the German Chancellor Angela Merkel has demanded", he said.
Writing in the Sunday Mirror, Mr Corbyn said there can be "no question of blind loyalty to the erratic and belligerent Trump administration" over the crisis.
United Kingdom tries to parry claims it's unprepared in Brexit talks
The joint comments by Hammond and Fox came after weeks of clashes over the UK's future outside the bloc. Former Prime Minister Tony Blair has also called for pro-EU politicians from all parties to unite.
He added: "We can not play fast and loose with nuclear weapons and nuclear threats because do you know what - a nuclear explosion doesn't stop at national borders, it doesn't stop at the vicinity where the bomb drops".
Although Article 5 of the North Atlantic Treaty states that an attack on one NATO member is an act of aggression against the entire military alliance, the application of this provision is limited only to attacks on member states' territories in North America, Europe and the Atlantic.
After Trump vowed on Tuesday to treat North Korean threats of hostility with "fire and fury like the world has never seen", the Kim regime announced that it is planning to launch four intermediate-range ballistic missiles into the Pacific Ocean near Guam, a US territory.
"President Trump and President Xi agreed North Korea must stop its provocative and escalatory behavior".
"This man will not get away with what he is doing", the billionaire said.