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…
‘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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‘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.
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.
‘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.”
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.”
‘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.”
Donald Trump has threatened sweeping new tariffs on Mexico, Canada and China on his first day in office.
The president-elect, who takes office on 20 January next year, said he would introduce a 25% tax on all products entering the country from Canada and Mexico.
Posting on his Truth Social platform he also threatened an additional 10% tariff on goods from China on top of any additional tariffs he might impose as one of his first executive orders.
If implemented, the tariffs could raise prices for ordinary American consumers on everything from petrol to cars and agricultural products.
The US is the largest importer of goods worldwide and Mexico, China and Canada are its top three suppliers according to the country’s own census data.
More than 83% of exports from Mexico went to the US in 2023 and 75% of Canadian exports go to the country.
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“On January 20th, as one of my many first Executive Orders, I will sign all necessary documents to charge Mexico and Canada a 25% Tariff on ALL products coming into the United States, and its ridiculous Open Borders,” Mr Trump said.
He also spoke against an influx of illegal immigrants heading into the country.
While migrant arrests reached a record high during President Joe Biden’s administration, illegal crossings fell dramatically this year as new border restrictions were introduced and Mexico stepped up enforcement.
Mr Trump added: “Both Mexico and Canada have the absolute right and power to easily solve this long simmering problem. We hereby demand that they use this power… and until such time that they do, it is time for them to pay a very big price!”
After issuing his tariff threat, Mr Trump spoke with Canadian Prime Minister Justin Trudeau and they were said to have discussed trade and border security.
“It was a good discussion and they will stay in touch,” a Canadian source said.
Turning to China, the president-elect said he “had many talks with China about the massive amounts of drugs, in particular Fentanyl, being sent into the United States – But to no avail.”
“Until such time as they stop, we will be charging China an additional 10% Tariff, above any additional Tariffs, on all of their many products coming into the United States of America,” he wrote.
The Chinese Embassy in Washington said that there would be losers on all sides if there is a trade war.
“China-US economic and trade cooperation is mutually beneficial in nature,” embassy spokesman Liu Pengyu posted on X. “No one will win a trade war or a tariff war.”
It isn’t clear if Mr Trump will actually go through with the threats.
He won the recent election in part due to voter frustration over inflation and high prices.
Mr Trump’s nominee for treasury secretary Scott Bessent – who if confirmed, would be one of a number of officials responsible for tariffs – has said previously that tariffs are a means of negotiation.
The dad of a missing Hawaiian woman who vanished took his own life after he flew to LA to try to find her.
Ryan Kobayashi had travelled from Hawaii to LA, retracing the steps his daughter Hannah Kobayashi took earlier this month before she went missing.
On 8 November, the 31-year-old Ms Kobayashi travelled from Hawaii to LA, on her way to New York, but missed her connecting flight.
Her family initially thought she would catch another one but she told them she had begun to explore the area.
Then, on 11 November, the family began receiving “strange and cryptic, just alarming” text messages from her phone.
They referenced her being “intercepted” as she got on a train and being scared someone was trying to steal her identity.
“Once the family started pressing, she went dark,” her aunt Larie Pidgeon said.
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Sky News US partner network NBC News reported that one of the texts received by Ms Kobayashi’s family read: “I got tricked pretty much into giving away all my funds for someone I thought I loved.”
Mr Kobayashi flew out to LA to try and find her, searching with other family members and volunteers.
However, he was found dead on Sunday in a car park near the LA International Airport having taken his own life, police and his family said.
In a statement, the family said: “After tirelessly searching throughout Los Angeles for 13 days, Hannah’s father, Ryan Kobayashi, tragically took his own life.
“This loss has compounded the family’s suffering immeasurably.”
They asked for privacy as they grieved and requested the public “maintain focus on the search for her. Hannah IS still actively missing and is believed to be in imminent danger. It is crucial for everyone to remain vigilant in their efforts to locate Hannah.”
Ms Kobayashi is a budding photographer from Maui and had been heading to New York for a new job and to visit relatives.
The RAD Movement, a network aimed at helping missing and exploited people, said in an appeal that in footage, Ms Kobayashi “does not appear to be in good condition and she is not alone”.
Ms Pidgeon added that the search effort has been focused in the downtown area of LA.
Anyone feeling emotionally distressed or suicidal can call Samaritans for help on 116 123 or email jo@samaritans.org in the UK. In the US, call the Samaritans branch in your area or 1 (800) 273-TALK.
A motion has been filed to drop the charges against Donald Trump of plotting to overturn the 2020 US presidential election result.
Mr Trump was first indicted on four felonies in August 2023: Conspiracy to defraud the United States, conspiracy to obstruct an official proceeding, obstruction of and an attempt to obstruct an official proceeding, and conspiracy against rights.
The president-elect pleaded not guilty to all charges and the case was then put on hold for months as Mr Trump’s team argued he could not be prosecuted.
On Monday, prosecutors working with special counsel Jack Smith, who had led the investigation, asked a federal judge to dismiss the case over long-standing US justice department policy, dating back to the 1970s, that presidents cannot be prosecuted while in office.
It marks the end of the department’s landmark effort to hold Mr Trump accountable for the attack on the US Capitol on 6 January 2021 when thousands of Trump supporters assaulted police, broke through barricades, and swarmed the Capitol in a bid to prevent the US Congress from certifying Joe Biden’s 2020 election victory.
Mr Smith’s team had been assessing how to wind down both the election interference case and the separate classified documents case in the wake of Mr Trump’s election victory over vice president Kamala Harris earlier this month, effectively killing any chance of success for the case.
In court papers, prosecutors said “the [US] Constitution requires that this case be dismissed before the defendant is inaugurated”.
They said the ban [on prosecuting sitting presidents] “is categorical and does not turn on the gravity of the crimes charged, the strength of the government’s proof, or the merits of the prosecution, which the government stands fully behind”.
Mr Trump, who has said he would sack Mr Smith as soon as he takes office in January, and promised to pardon some convicted rioters, has long dismissed both the 2020 election interference case and the separate classified documents case as politically motivated.
He was accused of illegally keeping classified papers after leaving office in 2021, some of which were allegedly found in his Mar-a-Lago home in Florida.
The election interference case stalled after the US Supreme Court ruled in July that former presidents have broad immunity from prosecution, which Mr Trump’s lawyers exploited to demand the charges against him be dismissed.
Mr Smith’s request to drop the case still needs to be approved by US District Judge Tanya Chutkan.
At least 1,500 cases have been brought against those accused of trying to overthrow the election result on 6 January 2021, resulting in more than 1,100 convictions, the Associated Press said.
More than 950 defendants have been sentenced and 600 of them jailed for terms ranging from a few days to 22 years.