The UK will play its “full part” in peacekeeping in Ukraine, Sir Keir Starmer has said.

The prime minister told Sky News’ political editor Beth Rigby that the conflict with Russia was not just about “sovereignty in Ukraine” but about the impact it also had on the UK, including the cost of living crisis.

Sir Keir was speaking to Sky News while on a surprise visit to Ukraine on Thursday – his first since his party’s landslide election win six months ago.

The purpose of the trip was to discuss the next steps for Ukraine, with the situation now more uncertain following Donald Trump’s election victory in November.

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Mr Trump, whose inauguration takes place on 20 January, has said he wants a peace deal between Russia and Ukraine within 100 days.

But some European leaders fear pushing Kyiv into a deal could lead to Ukraine ceding some of its territory to Vladimir Putin.

Sir Keir said he did not want “to get ahead of ourselves” but that the UK would play its “full part” in any peace negotiations – including by deploying British troops for peacekeeping.

Asked if he would be prepared to do that, the prime minister replied: “Well, I don’t want to get ahead of ourselves, but I do have indicated that we will play our full part – because this isn’t just about sovereignty in Ukraine.

“It’s about what the impact is back in the United Kingdom and our values, our freedom, our democracy. Because if Russia succeeds in this aggression, it will impact all of us for a very, very long time.”

On arriving in Ukraine to meet President Volodymyr Zelenskyy, a Russian drone was shot over the sky over the presidential palace.

Sir Keir said the drone threat was “a reminder of what Ukraine is facing every day” and that the war was brought about by “Russian aggression”.

Elsewhere in the interview, Sir Keir was asked about his views on Ukraine’s longstanding desire to join NATO – something President Putin strongly opposes.

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At a NATO summit in Washington last summer, the alliance’s members announced that Ukraine was on an “irreversible” path to NATO membership.

“We fully support Ukraine’s right to choose its own security arrangements and decide its own future, free from outside interference. Ukraine’s future is in NATO,” the declaration said.

However, Mr Zelenskyy has somewhat tempered his language around NATO membership, telling Sky News in an exclusive interview in November that a ceasefire deal could be struck if Ukrainian territory he controlled falls “under the NATO umbrella” – allowing him to negotiate the return of the rest later “in a diplomatic way”.

However, Mr Trump has acknowledged Moscow’s opposition to Ukraine joining NATO, saying: “Russia has somebody right on their doorstep, and I can understand their feeling about that.”

A man has been arrested after the death of a woman in her 20s and a two-year-old girl was found with serious injuries at an address in Ashford, Surrey.

The man, in his 30s, has been detained on suspicion of murder and attempted murder, Surrey Police said.

Officers went to a property in Woodthorpe Road, Ashford, at 1.15pm on Thursday following a report of concern for safety.

The woman and child were found at the address with serious injuries and despite treatment from paramedics, the woman died at the scene.

The child was taken to hospital.

An investigation, led by the Surrey and Sussex Police Major Crime Team, is under way and enquiries remain ongoing, police said.

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The man suspected of abducting Madeleine McCann won’t face any charges in the foreseeable future, a prosecutor has told Sky News.

German drifter Christian B, who cannot be fully identified under his country’s privacy law, is expected to be freed from an unrelated jail sentence this year while police in three countries continue to search for evidence against him.

Prosecutor Hans Christian Wolters said: “There is currently no prospect of an indictment in the Maddie case.

“As things stand, the accused Christian B’s imprisonment will end in early September.”

Madeleine, aged three, was asleep with her younger twin siblings in the family’s Portuguese rented holiday apartment before mother Kate discovered her missing at around 10pm on 3 May, 2007.

Her parents were dining nearby on the complex with friends and taking turns to check on all their sleeping children every half an hour.

Madeleine’s disappearance has become the world’s most mysterious missing child case.

Philipp Marquort, one of Christian B’s defence lawyers, welcomed the prosecutor’s pessimism about bringing charges.

He said: “This confirms the suspicions that we have repeatedly expressed, namely that there is no reliable evidence against our client.

“We regret that we have not yet been granted access to the investigation files. We have not yet been able to effectively counter the public prejudice arising from statements made by the prosecutor’s office.”

Christian B, 47, is in jail and coming to the end of his sentence for the rape of an elderly American woman in Praia da Luz, the Portuguese resort where Madeleine disappeared.

In October, he was acquitted on a series of rape and indecent assault charges after a non-jury trial in Germany, in which several references were made to his status as the main suspect in the Madeleine case.

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The prosecutor said he was awaiting the court’s written judgment before launching an appeal against the acquittal. He believes the trial judges were biased against the prosecution.

If successful, he could apply for a new arrest warrant for Christian B to keep him in custody until a retrial with new judges.

He said: “We hope that the Federal Court of Justice will decide before the end of the accused’s imprisonment. If the Federal Court follows our legal opinion, we could apply for a new arrest warrant for the accused’s offences, so that the accused would then remain in custody beyond September 2025.

Mr Marquort said the defence team would oppose the prosecution’s appeal against the acquittal.

Prosecutor Mr Wolters has said in the past that he believes Madeleine is dead and that Christian B was responsible for her death. The suspect denies any involvement.

The case against Christian B is purely circumstantial; he’s alleged to have confessed to a friend that he abducted Madeleine, he has convictions for sex crimes against children, he was living in the area at the time, his mobile phone was close by when the young girl vanished and he re-registered one of his vehicles the next day.

The prosecutor won’t say what evidence he has to convince him Madeleine is dead, but he admitted he is still trying to find forensic evidence to link Christian B to the girl.

Jim Gamble, former head of the UK Child Exploitation and Online Protection centre, said he had expected the prosecutor to charge Christian B soon.

“He’s implied the whole way through that he has something more than the public are aware of,” he said.

“He’s made fairly definitive statements about whether Madeleine is alive or dead so you would expect their strategy to have been to charge him sooner rather than later.

“From what he’s said today I wonder if we’re witnessing the re-positioning of something to manage the disappointment that’ll come.”

Mr Wolters, who is based in Braunschweig, Lower Saxony, is investigating the case with the help of Portuguese police and detectives from Scotland Yard.