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.”

Watch the full interview with Beth Rigby and Sir Keir Starmer on the Politics Hub with Sophy Ridge at 7pm.