US Speaker Mike Johnson has suggested Volodymyr Zelenskyy might need to leave office in order for Ukraine to achieve a peace deal with Russia, as Lord Mandelson says Kyiv should commit to a ceasefire before Russia.

“Something has to change,” Mr Johnson told NBC.

“Either he needs to come to his senses and come back to the table in gratitude or someone else needs to lead the country to do that,” he added, referring to Mr Zelenskyy.

The Republican said “it’s up to the Ukrainians to figure that out”.

Meanwhile Lord Mandelson, the UK’s ambassador to the US, told ABC News: “I think that Ukraine should be the first to commit to a ceasefire and defy the Russians to follow.

“And then, as part of the unfolding plan for this negotiation, the Europeans and perhaps some other countries too have got to consider how they are going to put forces on the ground to play their part in providing enduring security and deterrence for Ukraine.”

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The remarks came two days after a disastrous meeting between the Ukrainian president and Donald Trump and his vice president JD Vance descended into a shouting match in the Oval Office.

Mr Johnson said: “What President Zelenskyy did in the White House was effectively signal to us that he’s not ready for that yet and I think that’s a great disappointment.”

The fallout left a proposed agreement between Ukraine and the US to jointly develop Ukraine’s natural resources in limbo.

The idea of Mr Zelenskyy stepping aside also came up on Friday after the Oval Office meeting, with US Republican senator Lindsey Graham saying the Ukrainian leader “either needs to resign or send somebody over that we can do business with, or he needs to change”.

Meanwhile, White House national security adviser Mike Waltz said it is not clear Mr Zelenskyy is prepared to secure lasting peace with Russia.

“We need a leader that can deal with us, eventually deal with the Russians and end this war,” Mr Waltz told CNN when asked whether Mr Trump wants Mr Zelenskyy to resign.

“If it becomes apparent that President Zelenskyy’s either personal motivations or political motivations are divergent from ending the fighting in his country, then I think we have a real issue on our hands.”

US secretary of state Marco Rubio said he had not spoken to Mr Zelenskyy since the spat on Friday.

“We’ll be ready to re-engage when they’re ready to make peace,” Mr Rubio told ABC.

But Democratic senator Amy Klobuchar told ABC she was “appalled” by the clash in the Oval Office and said she met Mr Zelenskyy before he went to the White House on Friday and he had been excited to sign an expected minerals deal.

“There is still an opening here” for a peace deal, she said.

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It comes as Sir Keir Starmer hosted a summit between Mr Zelenskyy and other European leaders in an effort to get a peace plan back on track.

The prime minister said the UK, France and Ukraine would work on a ceasefire plan to present to the US.

Sir Keir, who visited Washington on Thursday, said he believes Mr Trump does want a “lasting peace” but warned Europe is in a “moment of real fragility” and he would not trust the word of Vladimir Putin.

Mr Zelenskyy will later meet the King.

Remarkable – and relatively speaking a blessing – that the wake-up call for Britain to take defence seriously again did not come in the form of a military attack on UK soil, but instead was triggered by the verbal assault of Ukraine’s wartime leader by a sitting US president.

The lack of any physical destruction on British streets, though, should fool no one in government or wider society that the framework of security that has protected the country and its allies since the end of the Second World War is not at best cracked and at worst shattered.

Instead, check out one of the latest posts by Elon Musk, Donald Trump’s “disrupter-in-chief”.

He used his social media site X to say “I agree” with a call for the United States to leave NATO – a transatlantic alliance, and the bedrock of European security, that the new administration had until now continued to back at least in public.

It is yet another example of escalating hostility from the new Trump White House – which has sided with Russia against Ukraine, lashed out at its European partners over their values, and even suggested absorbing Canada as the 51st American state.

The alarming mood-change by a nation that is meant to be a friend surely demands an equally dramatic shift in approach by NATO’s 30 European allies and their Canadian partner.

Rather than stating the obvious – that American support can no longer be taken for granted – they should instead be actively adapting to a world in which it fundamentally no longer exists.

Make no mistake, this would be a daunting and humbling prospect – perhaps too awful even to contemplate, in particular for the UK, which has tied itself militarily so closely to the US for pretty much everything from intelligence sharing and technology to nuclear weapons.

Britain is not alone. All European militaries, as well as Canada, to a greater or lesser extent rely heavily on their more powerful American partners.

Breaking that dependency would require a rapid expansion in military capabilities and capacity across the continent, as well as a huge effort to build up the defence industrial base required to produce weapons at scale and exploit emerging technologies.

Sir Keir Starmer – who is hosting a Ukraine summit of allies on Sunday – has rightly adopted the UK’s natural position of leadership in Europe in the wake of Donald Trump’s extraordinary hostility towards Volodymyr Zelenskyy. He gave the embattled Ukrainian president a warm embrace on Saturday when the two met at Downing Street.

Britain is one of Europe’s two nuclear-armed states, a powerful voice within NATO, and a permanent member of the United Nations Security Council.

But talking tough on defence and the need to support Ukraine as the US steps back is no longer enough in a world where hard power is the only real currency once again.

A pledge by the prime minister to increase defence spending to 2.5% of national income by 2027 and to 3% in the next parliament is of course a step in the right direction.

Yet unless it is accompanied by much greater speed and urgency coupled with a genuinely generational shift in the entire country’s approach to national security then it will go down in history as the headline-grabbing but otherwise empty gesture of a government that has forgotten what it means to be ready to fight wars.

Anneliese Dodds, who quit as international development secretary on Thursday over the prime minister’s plan to fund his increase in defence spending with a raid on the overseas aid budget, summed up the challenge well in her resignation letter.

She wrote that she supported the plan to lift the defence budget but said even 3% “may only be the start, and it will be impossible to raise the substantial resources needed just through tactical cuts to public spending”.

She added: “These are unprecedented times, when strategic decisions for the sake of our country’s security cannot be ducked.”

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Ms Dodds is right.

It is no longer good enough to treat defence, deterrence and wider national resilience as a niche subject that is delivered by an increasingly small, professional military.

Rather, it should once again be at the heart of the thinking of all government departments – from the Treasury and business to health and education – led by the prime minister, his national security adviser and the cabinet secretary.

This is not something new. It was normal during the Cold War years when, after two world wars, the whole country was acutely aware of the need to maintain costly but credible armed forces and a population that was ready to play its part in a crisis.

Ukrainians have told Sky News they still support Volodymyr Zelenskyy in the wake of his explosive row with Donald Trump.

Volodymyr Zelenskyy had travelled to Washington DC as he was due to clinch a deal on minerals with the US on Friday, but he left empty handed after a heated exchange in the Oval Office.

Under the watch of the world’s media, the final ten minutes of the meeting descended into a shouting match, as both Mr Trump and his vice president, JD Vance, accused Mr Zelenskyy of being “ungrateful”.

Mr Trump berated Mr Zelenskyy as “disrespectful”, while the Ukrainian leader tried to defend himself.

Kyiv citizens speaking to Sky News have said they stand by their president – despite calls from the US for him to stand down and hold an election.

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Nikita, 30, told Sky News: “He is the president, we selected him. So we trust him.”

He said it was “probably” likely Ukraine would be abandoned by America in the wake of the row, but he said he retained confidence in the governance of his nation.

“But I don’t have confidence on what will happen next,” he said.

“I really hope Europe will awake and maybe replace US support.”

He spoke in the centre of the city, while pushing his seven-month-old child in a pram. When asked about the future of Ukraine, he said if he was not sure the country had a future, then he would not have stayed.

‘Maybe America changed their mind’

Alla said she was “very disappointed” by how the conversation had played out.

“We were hoping for peace,” she said.

She said this morning it felt like “everything had changed, but we are hoping for the best anyway”.

“Ukraine is strong and will stand. That is our power.”

When asked about the potential withdrawal of US support, she said: “I hope Europe will help us. And I think maybe America also changed their mind, because I’ve seen a lot of American people who say they are sorry for Trump’s words, saying ‘I’m sorry, we are not Trump. We don’t think like this’.”

‘Our president was right’

Svitlana, 52, said simply: “Our president was right – we have no choice. Of course we want peace, we want a ceasefire, but Putin will not do that.

“He does not want peace. He wants to continue to totally destroy us.”

She said how, during the Oval Office meeting, a drone attacked medical facilities and other targets in Kharkiv, the country’s second largest city, injuring at least seven people, according to local officials.

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“This is not the behaviour of people who want peace,” she said.

Dmytro, 30, said it would still be possible to win the war without America.

“It would be hard, but with the help of European Union, with our own production, it would be possible,” he said.