UK Prime Minister Sir Keir Starmer has just concluded his first overseas visit as prime minister with his news conference at the Nato 75th anniversary summit in Washington, where he answered a number of wide-ranging questions from journalists.

• The prime minister said the UK has an "enduring and unwavering commitment to the Nato alliance", to helping Ukraine achieve victory over Russia, and the "collective security of our country, our continent and our allies around the world"
• Nato is "stronger than ever" and Britain will play "a full role" in the alliance, he said
• He added that spending 2.5% of GDP on defence is "now essential" for all members
• Asked by the BBC about the US President Joe Biden's slip-up half an hour or so earlier at the summit, in which he called Ukrainian leader Volodymyr Zelensky "President Putin", Starmer said the US leader deserves "credit" for hosting the summit and what it has achieved
• Starmer said he wanted to "reset" international relations as "there was a sense after Brexit that the UK had become too inward looking", and this included a new security agreement with EU nations
• Asked about the conflict in Gaza, he said a ceasefire "needs to be a foot in the door for a process towards a two-state solution, a viable Palestinian state alongside a safe and secure Israel"

We're going to be ending our coverage now, but you can follow President Biden's address, happening now, on this live page, being handled by our colleagues in Washington.

Finally, Starmer is pressed on his views on recognising a Palestinian state, something his government is committed to doing but hasn't set out a timeline for.

The former shadow culture secretary Thangam Debbonaire - who lost her seat to the Green Party - has said Labour lacked a coherent position on Gaza, an issue which cost it support in some parts of the UK.

Starmer says the UK position on the Middle East was discussed at Nato, and says his government's "solemn duty" is to help bring about an end to hostilities in the Middle East.

The PM says moving towards a two-state solution was discussed in Nato meetings and recognising a Palestinian state will be part of that process.

Asked whether he would consider recognising Palestinian statehood before the US, Starmer says: "I'll determine our policy, I won't follow anyone else."

And that's that from the prime minister - he'll now head back to the UK after concluding an extremely busy first week in office.

The prime minister this week indicated he hopes to reach a formal security agreement with EU nations.

Asked about his talks at the Nato summit with other leaders, Starmer says he feels the UK can "do more to work with our EU partners".

"It's good for us and it's good for them," he says, adding "at the moment there is no formal mechanism for doing that".

He says the "more we can do with security, the better for everyone for the protection of our country".

Starmer is next asked about prisons, with overcrowding a major issue the government is due to address on Friday.

Asked about deporting foreign criminals, Starmer says he won't be drawn on specifics ahead of that announcement.

However, Starmer is visibly angry as he talks about the "terrible problem" in the prison system, hitting the table as he talks about the "gross irresponsibility of the outgoing government".

He acknowledged how frustrated he is about the scale of the problem, calling it "unforgivable" and "shocking".

"I think when further details are released you will have plenty of extra questions for those who came before us," he adds.

Image source, Nato

Starmer is asked whether his past position opposing Brexit has helped him forge ties with European leaders in his early days as prime minister.

The PM says he wants a "reset" of relations and clarifies that is "not about going back into the EU".

He says the UK became too "inward looking" after Brexit and wasn't interested enough in its global position, saying he wants to change the "posture" of government.

"The UK is back, it's confident, we want to play our role on the world stage," is the message he want to send, Starmer tells reporters.

Pressed again on President Biden's gaffe, Starmer says: "This was a successful council, he led it, he deserves credit for it."

Now we're moving onto questions from journalists and Starmer is asked by the BBC's political editor Chris Mason about Joe Biden's gaffe earlier, when he introduced Ukrainian President Volodymyr Zelensky as "President Putin".

Starmer says he urges everyone to "look at the substance of what has been achieved at the summit" and "President Biden led through all of that".

"I think he deserves credit for that, as does the team who have worked with him," he adds.

Starmer says Nato faces a "new and dangerous era" with threats from Russia, aided by the likes of North Korea and lran.

Citing conflicts across the Middle East and north Africa, challenges of terrorism and threats to institutions, he says: "Collective action to this moment will shape the world for decades to come".

Nato is the most-successful alliance as freedom and rule of law are part of its values, he says.

Starmer recounts the "profound" impact seeing mass graves in Ukraine had on him when he visited there.

He says the "alternative to Ukraine's victory is unthinkable.... a green light to aggressors everywhere".

The PM repeats the new government's commitment to spending £3bn on aid for Ukraine for "as long as it takes".

He goes on to set out wider defence policies, including to "maintain and modernise" the nuclear deterrent and putting resources into defensive operations in the Baltic.

Starmer says the government will begin a strategic defence review and then set out a "clear path" to raise defence spending to 2.5%, which he says is "now essential".

He goes on to say "Britain belongs on the world stage", and mentions resetting the relationship with Europe, climate change and engaging with the global south.

Starmer begins by saying the policies to improve people's lives he was elected on depend on security, adding that security is his government's "first priority".

The PM says he gave a "clear message" to Nato on the UK's "unwavering commitment" to collective security and Ukraine.

Starmer goes on to talk about how it was a Labour government that helped set up Nato, saying "this is our history and we're proud of it".

He says we're living in a more dangerous era and begins to set out some of the challenges the UK is facing, including from Russia and North Korea.

UK Prime Minister Sir Keir Starmer is about to speak at a press conference before he leaves the Nato summit in Washington DC.

The new prime minister has been holding meetings with world leaders over the last two days and will fly home overnight.

But first, he'll take questions from journalists about what he believes he has achieved this week.

We'll be bringing you all the key lines here soon so stay with us.

Tom Bateman
Reporting from the Nato summit

An audible gasp just went up in the media centre here as President Biden introduced Ukraine’s leader to the stage, calling him “President Putin”.

Within moments, Biden walked back to the microphone and corrected himself saying: “President Putin? We’re going to beat Putin,” then correctly introducing him as President Zelensky.

The moment was being broadcast on huge screens in here at the international media centre where the slip up caused the stunned reaction.

Joe Biden has just introduced Ukrainian President Volodymyr Zelensky as "President Putin" on stage at Nato - a gaffe which comes as he faces intense scrutiny over his presidential candidacy.

It came after he set out defence pledges for Ukraine on stage along with other world leaders.

The US president immediately corrected himself, saying: "President Putin? He's going to beat President Putin.

"President Zelensky. I'm so worried about beating Putin, we've got to worry about it. Anyway."

Zelensky responded by joking "I'm better", to which Biden said "you are a hell of a lot better".

The slip-up comes amid intense domestic political pressure over whether Biden's age means he is mentally fit to continue as president for a second term.

Ahead of his press conference later today, Joe Biden has just been speaking to reporters about Nato's support of Ukraine, saying Kyiv has a pathway to joining the military alliance.

"We are united behind Ukraine," he says.

Yesterday, Nato endorsed an "irreversible path" to membership for Ukraine.

He is next asked about whether Nato has any plans to deal with a potential change of US president following the elections in November, as well as the increase in support in Europe for some right-wing parties.

Stoltenberg underlines that this is Nato's 75th anniversary and that throughout it's history it has seen many changes of government and different political parties in leadership.

In democracies "there are no guarantees", he says, but the alliance has proven "resilient".

Specifically on the US, he says he expects it will remain a "strong and loyal" ally because being in Nato makes the US "stronger and safer".

Stoltenberg ends with a question on the role of South Korea helping Ukraine. He says the country - one of the alliance's partners in the Indo-Pacific region - is "highly valued".

And that's it.

Stoltenberg now moves on to taking questions and is asked to comment on recent military drills conducted jointly by Belarus and China close to the Polish border.

He responds that the exercises are "part of a pattern" that confirms how authoritarian regimes are aligning "more and more" and coming closer to Nato in Europe, Africa, the Arctic and elsewhere.

He adds that it also fits into the pattern of authoritarian powers working closer together in supporting Russian aggression against Ukraine.

Stoltenberg continues to list some of the support measures that have been agreed at this summit.

It includes announcements on immediate military aid such as air defence and more bilateral security agreements between Ukraine and individual nations.

He says that all this support will make Ukraine "stronger" and set the foundations for Ukraine "to prevail".

Allies have agreed, he adds, that as Ukraine continues with "necessary reforms" Nato will support the country on its "irreversible path" to membership.

Ukraine can count on the alliance now and "in the long haul", he underlines.

Nato Secretary General Jens Stoltenberg says Ukraine has had a "difficult" winter and spring, and that delays in military support for the country have had "real consequences".

He says Ukrainians have shown "remarkable courage and tenacity" to hold the line but the alliance can't let this happen again, describing this summit as "turning a corner" and "putting in the foundations for Ukraine to prevail".

He says Nato members have agreed to launch security assistance and training for Ukraine, with a command centre in Germany and logistics hubs in the eastern part of the alliance, along with around 700 personnel.

Nato Secretary General Jens Stoltenberg is now delivering his news conference and outlining what members of the alliance have achieved at this week's summit.

We'll bring you the key lines.

Alex Therrien
Live reporter

Today is the last day of the Nato summit but we're still expecting to hear three more news conferences before things wrap up.

In the next few minutes Nato Secretary General Jens Stoltenberg is due up. The war in Ukraine has dominated the agenda of the summit.

We'll then hear from US President Joe Biden, as he continues to face down those calling for him to drop out of the presidential election. Sir Keir Starmer, who has this week been making his first appearance on the world stage as UK prime minister, will also address the summit.

Biden is due to begin speaking at 18:30 EDT (23:30 BST).

We'll have the key lines from all three news conferences here, but our colleagues in Washington DC are also running a live page on Biden that will cover his remarks in more detail.

Questions around Joe Biden's age and fitness to run for re-election as US president have been hanging over the Nato summit in Washington DC.

Earlier, the UK's new Prime Minister Sir Keir Starmer said the 81-year-old US president was on "really good form" when they met each other on Wednesday.

Watch below.