Donald Trump says he would end Russia’s war in Ukraine should he return to the White House – but any rushed deal will likely leave Kyiv much weaker and European security in even greater peril.
Another major flashpoint a Trump presidency would immediately seek to influence is the escalating conflict between Iran and Israel.
Mr Trump came close to direct war with Tehran during his first term in office and prior restraint could well give way to direct confrontation this time around.
Then there is the overwhelming longer-term challenge posed by China, with North Korea another growing headache especially after Mr Trump tried but failed to woo the leader of the hermit state during his first stint as commander-in-chief.
Image: Mr Trump meets North Korean leader Kim Jong Un in 2019. Pic: AP
With the US election on a knife edge, hostile and friendly capitals around the world have been gaming what a second Trump White House might mean for their respective national interests and for the most pressing global security threats.
Mr Trump’s track record of unpredictability is a challenge for traditional foes – but also for Washington’s closest allies, in particular fellow members of the NATO alliance.
The Republican nominee has made no secret of his frustration at how the US has for decades bankrolled the security blanket that protects Europe.
During his first term as president, Mr Trump threatened to withdraw the US from the alliance – a move that would almost certainly sound its death knell. His rhetoric did help to spur allies to dig deeper into their pockets and spend more on their militaries, though.
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But the damage of years of underinvestment is deep and the pace of recovery is too slow for European NATO allies and Canada to credibly stand on their own as a potent military force any time soon.
Image: Meeting Volodymyr Zelenskyy in New York in September – but what would a Trump presidency mean for Ukraine’s war with Russia? Pic: Reuters
In terms of immediacy when it comes to global crises, the impact of a Trump victory on 5 November would be felt most acutely by Ukraine and also by Iran.
The presidential candidate has repeatedly claimed that he would quickly end the Ukraine war, though without explaining how or what peace would look like.
In an indication of where his priorities lie, however, he has accused Ukrainian President Volodymyr Zelenskyy of being the “greatest salesman on earth” for securing tens of billions of dollars in weapons and other assistance that Washington has given to Kyiv.
Image: Pic: Reuters
Yet – coupled with Ukraine’s willingness to fight – that military aid is the biggest reason why Ukraine has managed to withstand almost 1,000 days of Vladimir Putin’swar.
Stop the flow of American weapons, and Ukrainian troops – despite their own ingenuity and the support of other allies – will simply lack the firepower to keep resisting the onslaught.
Image: Kamala Harris believes US support for Mr Zelenskyy and Ukraine is vital. Pic: Reuters
By contrast, US vice president Kamala Harris, who is vying for the top job, has made clear that she views continued support to Ukraine as being as vital to US and Western interests as it is to Kyiv’s – a far more familiar stance that echoes the view of her NATO partners.
While US support for Ukraine would undoubtedly change under a Trump administration, that is not the same as facilitating a complete surrender.
The former president – who portrays himself as the ultimate dealmaker and has adopted a new election slogan – “Trump will fix it” – will not want to be held responsible for the total absorption of Ukraine into Mr Putin’s orbit.
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How does the US election work?
Putin and Iran
His relationship with the Russian president is a particularly interesting dynamic.
But with the right advice, might a future President Trump be able to use his connection with Mr Putin to the West’s advantage?
At the very least, it adds a new level of unpredictability – which is perhaps the most important element when it comes to assessing the potential impact on the world of a second Trump term.
Image: Donald Trump said in 2020 ‘as long as I’m president of the United States, Iran will never be allowed to have a nuclear weapon’. Pic: Reuters
On Iran, in stark contrast to his approach to Russia’s war in Ukraine, a future President Trump may well back much greater US military support for Israel’s conflict against Tehran and its proxies – perhaps even direct involvement by US forces in strikes on Iran.
Mr Trump has an even tougher stance towards Tehran and its nuclear ambitions than Joe Biden’s administration.
His decision to rip up a major nuclear deal with Iran was one of his most significant foreign policy acts during his four years as president.
It is also personal, with Iran accused of hacking the Trump campaign in recent months – an attack that would surely only heighten tensions with Iran during any second Trump term.
On election night, Sky News will have access to the most comprehensive exit poll and vote-counting results from every state, county and demographic across America through its US-partner network NBC.
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Former US president Joe Biden has prostate cancer, his office has said.
The statement said Mr Biden, who left the White House in January, is reviewing options for treatment with his physicians.
It read: “Last week, President Joe Biden was seen for a new finding of a prostate nodule after experiencing increasing urinary symptoms.
“On Friday, he was diagnosed with prostate cancer, characterised by a Gleason score of 9 (Grade Group 5) with metastasis to the bone.
“While this represents a more aggressive form of the disease, the cancer appears to be hormone-sensitive which allows for effective management.
“The President and his family are reviewing treatment options with his physicians.”
Image: File pic: Reuters
According to Cancer Research UK, a Gleason score of 9 means the cancerous cells “look very abnormal” and the disease is “likely to grow quickly”.
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A source familiar with Mr Biden and his family’s thinking has told Sky’s US partner network, NBC News, that the former president is considering “multiple treatment options” – including hormone treatment for the cancer.
They added he is at his home in Wilmington, Delaware, and that as of now, it is unclear where the former president will be treated.
Mr Biden, 82, was the oldest person to ever serve as president, with concerns about his health raised regularly during his campaign for re-election last year.
A Mexican navy ship has hit the Brooklyn Bridge during a promotional tour in New York City.
The New York Fire Department said authorities were responding to injuries but had no details about how many people might have been hurt or whether they were on the vessel or on the bridge.
Sky’s US partner network NBC News reports that at least three people were seriously injured in the incident.
The Mexican navy said in a post on X that the Cuauhtemoc, an academy training vessel, was damaged in the accident, which has prevented it from continuing its voyage.
Eyewitness video of the collision posted online showed the mast of the ship, which was flying a large Mexican flag, scraping the underneath of the bridge.
Image: Pic: AP
The vessel then drifted toward the edge of the river as onlookers scrambled away from shore.
The Mexican navy said the status of personnel and material was under review by naval and local authorities, which were providing assistance.
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The Cuauhtemoc is about 297ft long and 40ft wide, according to the Mexican navy. It sailed for the first time in 1982.
Image: Pic: AP
Each year, it sets out at the end of classes at the naval military school to finish cadets’ training.
It left the Mexican port of Acapulco, on the Pacific coast, on 6 April with 277 people onboard, the navy said at the time.
This breaking news story is being updated and more details will be published shortly.
One person has died in a bomb explosion near a reproductive health clinic in California, authorities have said.
The incident took place in Palm Springs, a city two hours east of Los Angeles, and is being investigated as a possible car explosion.
The city’s mayor Ron DeHarte said one person died in the blast, adding that the bomb was “either in or near” a vehicle. The deceased’s identity is not known, Palm Springs police said.
Dr Maher Abdallah, who runs the American Reproductive Centers clinic, told the Associated Press his facility was damaged but all staff were safe and accounted for.
The explosion damaged the office space where the practice conducts patient consultations, but the IVF lab and stored embryos were unharmed, he added.
“I really have no clue what happened,” he said. “Thank God today happened to be a day that we have no patients.”
Image: Debris covers the ground after the explosion. Pic: ABC7 Los Angeles/AP
In a statement posted on Facebook the clinic said it was “heartbroken” to learn someone died in the explosion and added: “Our deepest condolences go out to the individuals and families affected.”
It continued: “Our mission has always been to help build families, and in times like these, we are reminded of just how fragile and precious life is.
“In the face of this tragedy, we remain committed to creating hope – because we believe that healing begins with community, compassion, and care.
The clinic will be fully operational on Monday, it added.
“This moment has shaken us – but it has not stopped us. We will continue to serve with strength, love, and the hope that brings new life into the world,” the statement concluded.
Image: Pic: ABC7 Los Angeles/AP
The Palm Springs city government said in a post on Facebook that the explosion happened on North Indian Canyon Drive, near East Tachevah Drive, before 11am local time (6pm GMT).
A burned-out car can be seen in a parking lot behind the building in aerial footage.
The blast caved in the clinic’s roof and blew debris across four lanes of the road.
Another person said he was inside a cannabis dispensary nearby when he felt a massive explosion.
Nima Tabrizi said: “The building just shook, and we go outside and there’s massive cloud smoke.”
Investigators from the FBI and the Bureau of Alcohol, Tobacco, Firearms and Explosives are travelling to the scene to help assess what happened.
California governor Gavin Newsom has been briefed on the explosion, his press office said.