In a world that has grown more dangerous in recent years, the nightmare scenario of a Third World War is in the public consciousness.
Earlier this year, UK Defence Secretary Grant Shapps warned the world could be engulfed by wars involving China, Russia, North Korea and Iran in the next five years, and said we are moving “from a post-war to pre-war world”.
The relief felt at the end of the Cold War in the late ’80s has been replaced with increasing alarm at Russia’s invasion of Ukraine, and there is outcry at the humanitarian catastrophe in Gaza.
Sky News spoke to experts about whether World War Three is a possibility – and if we really are living in a “pre-war world”.
Here’s what they had to say…
Image: F-35B Lightning jets on the deck of aircraft carrier HMS Prince of Wales. Pic: AS1 Amber Mayall RAF/PA Wire
‘The international order is fraying’
Hugh Lovatt, senior policy fellow at the European Council on Foreign Relations thinktank
“The reassuring news is we are not heading towards the Third World War,” he says.
While there are conflicts in tensions in various theatres – Ukraine, the Middle East, Asia-Pacific – these are all “separate and not connected”, according to Mr Lovatt.
“The Gaza war has been going on for six months and is driving regional escalation – Iran’s retaliation against Israel is just the latest example of this.”
There are implications for the international community, including the UK, for example in terms of the Houthi attacks on Red Sea shipping and the impact that has on global trade.
There is, he says, a risk that British troops become sucked into a conflict in the Middle East.
“We need to see these risks in a certain context which is they do impact the UK but they are not existential risks.
“This is also happening at a time when the international order is fraying, is under considerable strain. This is something that we should be very troubled by.”
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7:28
‘UK must be prepared for war’
‘More likely now than at any time since the end of the last world war’
Deborah Haynes, Sky News security and defence editor
Given the scale of the turmoil shaking parts of the globe – in particular in Ukraine and the Middle East – the potential for a spark that ignites World War Three already exists.
That does not mean an escalation to global confrontation is inevitable but it is arguably more likely now than at any time since the end of the last world war.
A decision by Iran to launch an unprecedented barrage of missiles and drones against Israel has just raised the stakes even higher.
Israel has vowed to respond though its allies, including the UK and the US, are urging restraint especially as they helped ensure the vast majority of incoming munitions were blasted out of the sky before they could cause harm on the ground.
Should Israel choose to retaliate, the crisis could yet be contained if its return strike is limited and any further Iranian response triggered by such an attack is also curbed. But they are two big ifs.
Image: A Royal Navy helicopter fires flares during NATO exercises. Pic: UK Ministry of Defence/Reuters
Also, every time even limited military action is taken there is the risk of error or miscalculation that leads to uncontrolled escalation to regional war.
What happens in the Middle East also has a global impact, especially because Iran is backed by Russia and has close ties to China, while Israel’s strongest allies, led by the US, are predominately Western nations.
It means the crisis pitches authoritarian states against democracies – just as the concurrent war in Europe does.
Despite vows of Western support, Russia is slowly gaining ground in Ukraine. Western allies are failing to deliver the weapons and ammunition the Ukrainian military needs – leading to an almost inevitable retreat unless the balance of military strength on the ground changes.
Success by Vladimir Putin in Ukraine may embolden the Russian president, whose country is on a “total war” footing, to test the strength of the NATO alliance by invading a member state.
Again, this would create a direct war between authoritarian Moscow, armed by Iran, North Korea and also with assistance from China, against the West’s NATO alliance.
Evidence that military force has proved effective against Western powers could further harden China’s resolve to make good on a pledge to reunite the island of Taiwan with the mainland even if that means invading.
Such a move could also plunge Asia into conflict, again along the same dividing line of authoritarian states versus democracies.
Image: F-35B Lightning jets on the deck of aircraft carrier HMS Prince of Wales. Pic: AS1 Amber Mayall RAF/PA Wire
‘Diversion of attention’
Edward R Arnold, senior research fellow at the Royal United Services Institute (RUSI) thinktank
“I think people really need to understand what the North Atlantic Treaty is, which is the foundation of NATO,” he says.
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Mr Arnold argues that the public seem to believe that NATO’s Article 5 (the principle that an attack on one member is treated as an attack on all) is automatic.
“That’s not the case or certainly does not have to be the case… escalation is not automatic and there are measures to de-escalate things.”
Looking to the situation in Ukraine, where NATO has been providing weapons and assistance, he says the risk of a miscommunication between the West and Russia has increased.
“The chances of a miscommunication where one ship accidentally fires on another, I think that goes up.
“We need to be really prepared about what that means.”
Image: Ukrainian servicemen fire a BM-21 Grad multiple launch rocket system (MLRS). Pic: Reuters
He also argues that in some ways the threat of a wider conflict with Russia is reducing at the moment. Kremlin forces are starting to make progress in Ukraine, but the quality of their troops has been degraded significantly such that they are not in a position to present a threat to NATO.
Mr Arnold continued: “Vladimir Putin will be looking pretty closely at what happens in the Middle East: how each nation responds and just the diversion of attention (from Ukraine).
“It’s all helping Putin at the moment because while focused on the Middle East we are not as focused as we have been on Ukraine.”
Image: Vladimir Putin speaks with Commander Artyom Zhoga. Pic: Reuters
‘Donald Trump could undermine NATO’
Dr Luigi Scazzieri, senior research fellow at the Centre for European Reform thinktank
“It depends on your definition of World War Three. A possible conflict between Iran and Israel has the potential to expand into a major military conflagration in the Middle East, with global implications.
“The US would almost certainly be drawn in on Israel’s side and other Western countries, including the UK, may do the same to a lesser extent.
“But their involvement would be limited and this would not be World War Three, not least as Russia can ill-afford to support Iran and because China is unlikely to.
“The impact of such a conflict on Europe would be primarily economic, through further disruption in energy flows and trade.
“The primary pathway to a World War Three scenario remains a direct Western clash with Russia. That scenario will be more likely if Donald Trump wins and undermines NATO, tempting Vladimir Putin into an attack on the Baltics.
“A clash with Russia would also be quite likely if Western forces become involved in supporting Ukraine in frontline combat roles.”
The producer of Charlie Kirk’s podcast has claimed that a “miracle” stopped more people being killed by the bullet that hit the right-wing influencer.
Andrew Kolvet claimed to have spoken to a surgeon that tried to save Mr Kirk’s life, and posted on social media to discuss the apparent lack of an exit wound.
A prominent right-wing figure in the US, Mr Kirk was a staunch ally of President Donald Trump and was known for his conservative viewpoints on abortion, religion and LGBT issues.
Mr Trump and other public figures are expected to be in Arizonaon Sunday for a memorial service for Mr Kirk which is expected to draw 100,000 people.
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0:50
Prosecutors detail case against Charlie Kirk’s alleged killer
Mr Kolvet, executive producer of the Charlie Kirk Show, apologised for the “somewhat graphic” nature of his post on X.
In it, he discussed what he said was a lack of an exit wound from the bullet, despite it being “a high powered, high velocity round”.
Mr Kolvet included what he said were quotes from a surgeon who operated on Mr Kirk.
“It was an absolute miracle that someone else didn’t get killed,” Mr Kolvet quoted the surgeon as saying.
“His bone was so healthy and the density was so so impressive that he’s like the man of steel. It should have just gone through and through. It likely would have killed those standing behind him too.”
Mr Kolvet said what happened was “remarkable” and “miraculous”.
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0:55
Crowds chant at Charlie Kirk vigil at Texas university
President Trump and JD Vance are expected to be among the prominent MAGA members who will pay tribute to Mr Kirk at the memorial event.
It will take place at State Farm Stadium, the home of the Arizona Cardinals NFL team, amid a heavy law enforcement presence.
Image: State Farm Stadium in Arizona. Pic: Reuters
President Trump has blamed the “radical left” for the death of Mr Kirk, whom he credited for helping him win the 2024 presidential election.
It comes as the death of Mr Kirk has turned into a debate over the First Amendment.
While they have repeatedly criticised what they claim are assaults on free speech, members of the MAGA movement appear to be taking a different stance when the subject is one of their own, launching attacks on people they deem to be making disparaging comments about Mr Kirk.
Dozens of people, from journalists to teachers, have already lost their jobs for allegedly making offensive comments about the podcaster.
Late-night chat show host Jimmy Kimmel was pulled from the air indefinitely by ABC following a backlash from the Trump-appointed head of the Federal Communications Commission over the comedian’s remarks about Mr Kirk.
The State Department also has warned it would revoke the visas of any foreigners who celebrated his assassination.
Lawyers for Luigi Mangione have called on a judge to block federal prosecutors from seeking the death penalty against him.
Mangione’s legal team says the 27-year-old’s case has been turned into a “Marvel movie” after a failed bid by the US Justice Department to indict him on terrorism charges over the fatal shooting of UnitedHealthcare chief executive Brian Thompson in New York on 4 December.
New York state judge Gregory Carro said there was no evidence that the killing, which took place as Mr Thompson walked into an investor conference at the New York Hilton Midtown hotel, amounted to a terrorist act.
But Judge Carro upheld second-degree murder charges, which suggest there was malicious intent – but not that it was premeditated.
US Attorney General Pam Bondi has called for Mangione to face capital punishment, describing the charges against him as a “premeditated cold-blooded assassination that shocked America”.
But in the new court filing, Mangione’s legal team argues federal prosecutors have “violated Mr Mangione’s constitutional and statutory rights” by “staging a dehumanizing, unconstitutional ‘perp walk’ where he was televised, videotaped, and photographed clambering out of a helicopter in shackles” on the way to his first court appearance.
The legal team, led by former Manhattan prosecutor Karen Friedman Agnifilo, also claims the death penalty case has been “fatally prejudiced” after President Donald Trump commented on it on Fox News.
Despite laws that prohibit any pre-trial commentary that could prejudice the defendant’s right to a free trial, he told the network on Thursday: “Think about Mangione. He shot someone in the back, as clear as you’re looking at me or I’m looking at you.”
Image: UnitedHealthcare chief executive Brian Thompson.
Pic: UnitedHealth Group/AP
The defence team’s 114-page court filing reads: “There is a high bar to dismissing an indictment due to pretrial publicity.
“However, there has never been a situation remotely like this one where prejudice has been so great against a death-eligible defendant.”
Federal prosecutors have until 31 October to respond to the documents.
Mangione has pleaded not guilty to all the state charges against him, which cannot result in the death penalty and only life imprisonment, unlike federal ones. He has also pleaded not guilty to the federal charges.
He is due back in court for a pre-trial hearing in the state case on 1 December and the federal case on 5 December.
The 27-year-old was arrested five days after Mr Thompson was killed – when he was spotted at a McDonald’s in Altoona, Pennsylvania, around 230 miles west of New York City.
Journalists at the Pentagon have been told they could be barred if they gather or report information that officials haven’t approved first.
Reporters’ access to the iconic building, the headquarters of the US defence department, is also being curtailed.
Pete Hegseth, the defence secretary, posted on X: “The ‘press’ does not run the Pentagon – the people do.
“The press is no longer allowed to roam the halls of a secure facility. Wear a badge and follow the rules – or go home.”
A memo announcing the changes was sent to reporters on Friday, informing them “information must be approved for public release by an appropriate authorizing official before it is released, even if it is unclassified”.
They must sign an agreement agreeing to the new rules or face having their press pass revoked.
Journalists’ groups said it was a dangerous move that would seriously restrict their ability to hold defence officials to account.
The National Press Club called it “a direct assault on independent journalism at the very place where independent scrutiny matters most: the US military”.
The Society of Professional Journalists said it “would deny the American people the transparency and accountability they deserve”.
“This policy reeks of prior restraint – the most egregious violation of press freedom under the First Amendment – and is a dangerous step toward government censorship,” it said.
“Attempts to silence the press under the guise of ‘security’ are part of a disturbing pattern of growing government hostility toward transparency and democratic norms.”
Image: The Pentagon is home to the newly rebranded Department of War
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The first year of US President Donald Trump’s second term has seen several embarrassing episodes for the Pentagon.
A journalist revealed in March that he had accidentally been included on a group chat, which included the defence secretary and vice president, discussing plans to attack Houthi rebels in Yemen.
The Pentagon said no classified information had been shared but opponents said it showed a worryingly lax approach that could endanger US troops.
Doubts were also raised about America’s bombing of Iran’s nuclear sites earlier this year after a leaked intelligence report suggested the attack had only set the regime back “by months”.
President Trump and the CIA both hit back hard against the report, with the president insisting the underground facilities had been “blown to kingdom come”.