Image source, EPA

Let's take a look now at some more detail on the new US security package to Ukraine, worth $225m (£174m), that was announced today.

It includes a Patriot missile battery, additional ammunition for high-mobility artillery rocket systems and missiles, among other items.

The US has provided more than $50bn in military aid since Russia's full-scale invasion of Ukraine in 2022 - more than any country.

In April, the US House of Representatives finally approved $61bn in new US military aid to Ukraine. The much-delayed support had vocal opponents in Congress and it took a fragile bipartisan deal to get the package through.

Image source, EPA

One of the key moments of the Nato conference will be Joe Biden's news conference, expected later today.

It's important because of the leading role the US plays in Nato, but there's an even greater focus on Biden's remarks than normal.

The news conference will be his first since his heavily criticised performance in a debate with Donald Trump.

Solo and unscripted, these remarks will be a key test for Biden at a time when there has been much scrutiny of his mental fitness.

He's due to begin speaking at 18:30 EDT (23:30 BST).

We'll continue to provide updates on this page with a particular focus on Nato. But if you're looking for coverage more focused on Biden's domestic political challenges, then our BBC colleagues in the US have you covered - you can follow along here.

A little earlier, we heard Nato Secretary General Jens Stoltenberg speak about a move for long-range US missiles to be deployed periodically in Germany from 2026 - for the first time since the Cold War.

This decision was announced via a joint statement , externalfrom the US and Germany yesterday.

The Tomahawk cruise, SM-6 and hypersonic missiles have a significantly longer range than existing missiles.

The joint US-German statement made clear the "episodic" deployment of the missiles was initially seen as temporary but would later become permanent, as part of a US commitment to Nato and Europe's "integrated deterrence".

German Defence Minister Boris Pistorius has said the idea behind the plan is to encourage Germany and other European countries to put their own investment into longer-range missiles.

Russian Deputy Foreign Minister Sergei Ryabkov said Moscow would react with a "military reponse to the new threat".

Our full story on that is here.

Image source, Reuters

We've just been hearing from Ukrainian President Volodymyr Zelensky and Nato Secretary-General Jens Stoltenberg.

Here's a round-up of what they said:

• Zelensky said that Nato's support for Ukraine is crucial for curbing Russia's "appetite for aggression"
• He said he will "do everything" to ensure that Ukraine joins Nato
• Stoltenberg said Ukraine's "future is in Nato" and that the country is on an "irreversible path" to membership
• Asked about restrictions on Ukraine using weapons from Nato members to attack targets inside Russia, Zelensky said it should be able to respond if Moscow kills its civilians
• "If we really want to have Ukraine on the map...we need to do concrete steps, very quick steps," Zelensky said

Image source, Reuters

They are asked about Hungarian PM Viktor Orban's trip to Russia to see Vladimir Putin this week.

"It's not for Nato to try and regulate travel plans for Nato leaders," Stoltenberg says.

What matters is that Nato leaders agree on policy and the alliance agreed on a "very strong" declaration yesterday that upholds Ukraine's "territorial integrity", he adds.

The two men shake hands and the press conference is over.

Stoltenberg follows up, saying this agreement between the US and Germany demonstrates the US commitment to Nato and European security - a "clear and welcome message".

He also adds this it demonstrates Nato is about deterrents.

"We have strengthened our collective defence".

The BBC's defence correspondent Jonathan Beale now asks whether an agreement between the US and Germany to allow long-range missiles from the US to go into Germany "from time to time" could antagonise Russia.

Zelensky says Ukraine should be able to respond if Russia kills its civilians.

He says he's had "good messages" from UK leaders.

"If we really want to have Ukraine on the map ... we need to do concrete steps, very quick steps," he says.

Image source, Reuters

Next Stoltenberg is asked about restrictions placed on Ukraine using weapons from Nato members.

He responds by underlining that this is a "war of aggression" launched by Russia and that Ukraine has the right to defend itself.

He says restrictions vary between allies - some have imposed none - while others are loosening them. He says he welcomes allies loosening restrictions.

Zelensky follows up on Stoltenberg's comments, reiterating that Ukraine is "very close" to the goal of joining Nato.

The next step will be invitation and membership, he says.

"I hope we will prevail."

He says that the word "success" often isn't appropriate in war but that it would be a success for both Ukraine and Nato if his country joins the alliance.

Now the pair are taking questions.

Stoltenberg is asked about a CNN report, external that the US and Germany foiled a Russian plot to assassinate the chief executive of a German arms manufacturer producing artillery shells for Ukraine.

He says he won't comment on the report but says there has been a Russian campaign to conduct hostile actions to intimidate Nato allies. Stoltenberg says the allies are not intimidated.

Image source, Reuters

Zelensky says Nato support for Ukraine is "crucial" and will help curb Russian President Vladimir Putin's “appetite for aggression”.

He says he will "do everything" to ensure that Ukraine joins Nato and that they are edging closer.

"I am confident we will achieve this," he says, before finishing with Slava Ukraini, which means "Glory to Ukraine".

President Zelensky is now speaking.

He points out that Russia invaded Ukraine and emphasises the importance of strengthening his country to ensure wars of aggression do not become normal.

He adds that allies have become stronger over the course of the war.

Stoltenberg continues by promising that Nato will work more closely with Ukraine's armed forces.

He says Ukraine's "future is in Nato" and that the country is on an "irreversible path" to membership of the alliance.

He says that the deep cooperation between Nato and Ukraine is going even further.

Image source, Reuters

The news conference has begun.

Nato Secretary General Jens Stoltenberg begins by welcoming President Zelensky, saying allies at the summit have been "eager" to demonstrate their support for Ukraine.

He talks about the "unprecedented support" the alliance has provided Ukraine since the last summit and talks about future support that will be given to the country.

Among this is financial assistance with a minimum baseline of 40bn euros of military aid within the next year.

Ukraine's President Volodymyr Zelensky is due to give a news conference shortly, alongside Nato chief Jens Stoltenburg.

We'll bring you the key lines here and you can follow along by tapping watch live above.

Image source, Reuters

Joe Biden has told Ukraine's President Volodymyr Zelensky that the US would be providing a new security package for Kyiv.

Speaking at a bilateral meeting between the two leaders during the ongoing Nato summit in Washington, the US president tells Zelensky: "We will stay with you, period."

Biden says this will be the eighth such package he has authorised since signing a national security bill.

"We're working with our Nato allies to ensure Ukraine is flying F-16s this summer, and we show the world that we stand with Ukraine now and in the future," the president adds.

Meanwhile, Zelensky has called for a second peace summit this year.

As a reminder - a summit was held in Switzerland last month. Russia had not been invited.

Nato - the North Atlantic Treaty Organization - was formed in 1949 by 12 countries, including the US, UK, Canada and France.

Its founding treaty was signed in Washington DC, and leaders of Nato countries marked the 75th anniversary on the first day of the summit, which is taking place between 9-11 July.

Nato's primary purpose was to block expansion in Europe by the Soviet Union - a group of communist republics which included Russia.

Members agree that if one of them is attacked, the others should help defend it.

Nato does not have an army of its own but member countries can take collective military action in response to crises.

Nato has 32 members across Europe and North America, including the UK, US, Canada, France, Germany, Italy, Spain and Turkey.

Ukraine is not currently a member but Ukraine's President Zelensky has asked for his country to be admitted as soon as possible after its war with Russia ends.

• Read more here

Image source, @ZelenskyyUa

Ukraine's president has held talks with the leaders and representatives of Nato's Indo-Pacific partner nations - Japan, South Korea, Australia and New Zealand - for the first time, in Washington DC.

Posting on X, he says they discussed the "rapidly changing situation" in the region and the "need for unity and coherence in security matters".

"I stressed that, in the face of relentless Russian attacks, Ukraine urgently needs to bolster its air defences with additional air defence and electronic warfare systems," he adds.

We're expecting to hear from Zelensky at a news conference in Washington soon - we'll bring you his remarks live.

Romania, Bulgaria and Greece have signed a deal that will allow troops and weapons to quickly move across their borders on the alliance's eastern flank.

Some Nato member states had previously said that transnational troop movements were slowed by bureaucracy and red tape.

This new agreement seeks to "optimise transport corridors to respond to military mobility needs by creating road and rail supply lines between the participating states, reducing peace time bureaucracy and maximising efficiency in case of emergency situations".

The three countries could also connect their ports in both the Black and Aegean seas.

Separately, Romania and Bulgaria's defence ministers have signed a memorandum of understanding to set up a command centre to oversee special operations forces operating in the Black Sea region.

Jonathan Beale
Defence correspondent, reporting from Washington DC

With the arrival of F-16 fighter jet, Admiral Bauer suggests that Ukraine’s airfields might come under greater threat and that it would have to look at “other means to land them” - like operating them from highways.

He says he wasn’t able to comment on whether Ukraine would be permitted to use the F-16 jets to carry out strikes on military targets inside Russia.

He says that was a matter between the nations providing the jets.

The US, Denmark, the Netherlands and Norway are among the coalition of nations behind the initiative to send F-16s to Ukraine.