UK Defence Secretary Ben Wallace says that 97% of the Russian army is now estimated to be in Ukraine
They are suffering "First World War levels of attrition", he tells the BBC, but rules out sending fighter jets to Ukrainian forces anytime soon
Earlier Wallace dismissed reports he would resign if he did not get the extra defence budget he wants in next month's Budget
Nato members are meeting for a second day in Brussels to discuss support for Ukraine - with tanks expected to be high on the agenda
A British man killed in Ukraine has been named by friends and family as Jonathan Shenkin from Glasgow
Lloyd Austin continues: "Together we have committed nearly $50bn in legal assistance since the start of Russia’s all-out invasion.
"Our co-ordination is making a real difference in real time."
However, he says while "all of these donations flow from our unity and resolve, we still have much more to do together, and we need to intensify our focus."
"Ukraine's friends did not falter", Austin continues, alluding to the support offered to the country by its allies.
As a result, Ukraine "won the battles of Kyiv, Kharkiv and Kherson", he says.
He promises that Nato's "unshakeable, enduring support" for the country will not falter.
Image source, EPAUS Defence Secretary Lloyd Austin has now started speaking - where he addresses Nato's support for "a free and sovereign Ukraine".
"Over a year ago, Putin thought in a matter of days his forces would seize Kyiv and overthrow Ukraine’s demo govt and he thought the international community would just live with it.
"Putin’s invasion has been a test for the ages, and a test for the world."
US Secretary of Defence Lloyd Austin is about to speak ahead of a meeting of the Ukraine Defence Contact Group in Brussels.
This is where Western allies meet to discuss what they can do to provide support for the government in Kyiv as it attempts to push back Russian forces from its territory.
You can watch Austin's statement by clicking on the play button in the picture above.
Image source, ReutersLet's look at this fresh discussion of weapons supplies from the West against the backdrop of the latest fighting in Ukraine.
Mercenaries from the Russian Wagner Group have "almost certainly made further small gains" around the northern outskirts of the town of Bakhmut, says the UK's Ministry of Defence (MoD).
But in its latest assessment, the MoD says "organised Ukrainian defence continues" around the contested eastern town - and that a Russian advance to the south has "likely made little progress".
The regional governor said late yesterday that there was "not a single square metre" in the town that was safe from Russian fire. And Ukraine's President Volodymyr Zelensky himself offered words of thanks to the town's defenders in his regular evening address.
Image source, .The front-line eastern town lies between areas held by Russia and land held or regained by Ukraine
Image source, ReutersThe US announced in January that it would send Abrams tanks to Ukraine
Germany, the US and UK all announced in January that they would be sending tanks to Ukraine.
Ukraine has also been supplied with armoured fighting vehicles and various air defence systems, as well as anti-tank weapons, missiles, rocket launchers, helicopters and ammunition.
However, Ukraine has recently renewed calls for fighter jets to help better defend its skies.
Find out more about some of the weapons being supplied to Ukraine here.
If you're just joining us, or need a recap, here's a quick rundown of what Nato's secretary-general Jens Stoltenberg just said ahead of a meeting of the alliance's defence ministers in Brussels:
On weapons... he said Ukraine needs everything that's been promised, including weaponry, modern systems and particularly ammunition, to continue having success on the battlefield.
On Putin... he said Nato sees "no signs" of the Russian leader "preparing for peace" and instead believes Moscow is readying "new offensives and new attacks".
On aircraft... he said talks are under way about the possibility of providing aircraft to Ukraine, which comes almost a week after Ukraine's President Volodymyr Zelensky made a public plea to the UK for jets.
On the year anniversary of the Ukraine-Russia war... he said the conflict didn't begin last February - and pointed instead to the annexation of Crimea in 2014 as a starting point.
Image source, ReutersStoltenberg is asked about the UK scheme in which Ukrainian pilots receive fighter jet training.
Can Nato commit to doing the same? a journalist asks.
The Nato boss says allies are "consulting" on lots of options, including delivering more aircraft to Ukraine.
The most important thing, he says, is getting Ukraine the weaponry, ammunition and systems it has been promised. They're what will help on the battlefield, he says.
With that, he thanks reporters and heads off in the direction where it's assumed this morning's meeting is taking place.
Image source, EPAUkrainian troops are being trained in the UK so they can use Challenge 2 tanks on the battlefield
Stoltenberg says as well as weapons, allies must discuss logistics in Ukraine.
We can't just send weapons, he tells reporters, adding that ammunition and equipment is also key.
He also says the focus can't just be on sending "new systems" to Ukraine, but on ensuring that "existing systems" work.
Stoltenberg says it's important to remember that the war in Ukraine "didn't start last year, it started in 2014" (when Russia annexed Crimea).
Because of this, he says, lots of defence systems were already in place. These must be reviewed and refined, he adds.
Following that brief opening statement to reporters, Stoltenberg mentions last week's earthquake in Turkey, which affected families there and in Syria.
He says Nato is "horrified" by what happened, and will continue helping in any way that it can.
He's now taking a few questions from reporters.
Things are getting under way at Nato HQ in Brussels - and we're hearing from secretary-general Jens Stoltenberg.
He says its "more important than ever" that allies of Ukraine meet to discuss what needs to be done to help Ukraine defend itself against Russia.
As well as discussing what's needed in Ukraine, he says allies will start discussing the so-called Defence Investment Pledge.
Image source, ReuWhat's happening? Nato defence ministers are gathering in Brussels today, to discuss how countries can supply Ukraine with more weapons and military training in a bid to repel a renewed Russian offensive.
Who's going? The first meeting of the day is to be attended by members of the US-led Ukraine Defence Contact Group, including US Secretary of Defence Lloyd J Austin III. Ukraine's Defence Minister Oleksii Reznikov will also be in attendance. Jens Stoltenberg, Nato's secretary-general, will likely play a key role in today's proceedings too.
Has anything been said yet? Ahead of the meeting, Stoltenberg said members were in a "race of logistics" and urged them to do two things:
Do we know timings? Members of the Defence Contact Group have begun arriving for their meeting this morning, which will be followed by a session of the North Atlantic Council (basically the defence ministers of Nato member states) in the afternoon.
There'll also be a press conference later on. Stay with us for live updates and analysis as the day unfolds.