Over the last few hours, we've been bringing you updates as Ukraine continues its incursion in Russia's Kursk region. Here's a look at some of the main developments from today:

• Ukraine now controls 74 settlements in Kursk, the country's president, Volodymyr Zelensky, said, having launched its incursion there last week. The region's governor said on Monday that Ukraine controls 28
• Ukraine's foreign ministry says it is not interested in "taking territory" in the region, but will continue its offensive until Russia agrees to "a just peace"
• In a briefing earlier, the US state department said it was not involved in any preparations for Ukraine's incursion
• Kyiv's chief of staff said movement has been restricted for Ukrainian civilians within a 20km (12 mile) zone bordering Russia
• Ukraine's top commander has said Kyiv's forces control 1,000 sq km of Russian territory, but the US-based Institute for the Study of War think tank did not believe all the area was under Ukrainian control

• About 200 people who left Kursk arrived in Moscow today, Russia's emergency ministry said. Yesterday, officials said at least 121,000 people had fled the region, with a further 59,000 told to leave

We'll be pausing our coverage shortly, but you can read more about today's developments here.

The US says it was not involved in any aspect of planning or preparation for Ukraine's incursion in Russia, a state department spokesperson says.

Vedant Patel tells reporters: "Our role is supporting Ukraine in defending itself, especially when it comes to defending itself against attacks or operations that may be immediately across the border.

"We will remain focused in ensuring that our Ukrainian partners have what they need to do that."

James Waterhouse
Reporting from the Sumy region

Image source, Reuters

It's an offensive that has seized hundreds of square kilometres of Russian territory and palpably restored momentum and morale to Ukraine’s war effort.

The Russian official in charge of the border region of Kursk has spoken of 28 settlements under Ukrainian control and almost 200,000 Russians have fled their homes.

Exactly how much Russian territory has been seized is uncertain, although there is scepticism over Commander-in-Chief Oleksandr Syrksyi’s claim that 1,000 sq km is under Ukrainian control.

The goal of this offensive is unclear, although President Volodymyr Zelensky has spoken of targeting sites from which Russia can launch attacks on Ukraine and bringing “a just peace” closer. But it is evident Kyiv is deploying some of its best troops.

Over the Telegram messaging app, a soldier tells us months of planning went into forcing Moscow to move troops from other parts of the front line in Ukraine.

“The element of surprise worked,” he says. “We entered easily with little resistance".

“Almost immediately they reached the western outskirts of the city of Sudzha,” he adds.

Read more here.

Russia says it has summoned a senior Moldovan diplomat to express "serious concern" over reports that an F-16 aircraft transferred to Ukraine from the West would be based in Moldova and might be used against Russian territory.

Moldova’s foreign ministry has denied it had plans to host the aircraft or any weapons and military equipment for Ukraine.

It added that Russia was referring to "fake news".

Ukraine now controls 74 settlements in Russia's Kursk border region, the country's president Volodymyr Zelensky says.

The region's governor on Monday said that Ukraine controls 28 settlements.

"Despite the difficult and intense battles, our forces continue to advance in the Kursk region, and our state’s “exchange fund” is growing", Zelensky says in a post on X.

He adds that "inspections and stabilisation measures are being carried out" in the region, and that the "development of humanitarian solutions for these territories continues".

Ukraine showing no sign of withdrawal from Kurskpublished at 16:58 British Summer Time 13 August

16:58 BST 13 August

Charles Haviland
Europe regional editor

A spokesman for Ukraine foreign ministry said that unlike Russia, Kyiv "doesn't need what belongs to someone else".

Its interest was not in taking away Kursk land, but in protecting its own people's lives, the spokesman said.

The Kremlin, he added, had launched more than 2,000 strikes from Kursk into his country since the start of the summer – and Kyiv didn't have the weapons to retaliate with long-range strikes.

He also said Kyiv's incursion would deplete Russia's firepower in occupied eastern Ukraine.

Analysts say though that there's a danger Ukraine will leave its own frontline exposed in that region. Moscow said today it had foiled fresh attacks by Kyiv in Kursk, but there's no sign of a withdrawal.

Here's some of the latest images of Ukrainian troops in Sumy, near the border with Russia:

Image source, Reuters

Image source, Reuters

Image source, Getty Images

Image source, Reuters

Image source, Getty Images

• Ukraine says it is not interested in "taking territory" in Russia's Kursk region, where Kyiv launched an incursion last week
• Ukraine's foreign ministry says it will continue its offensive in Russia until Moscow agrees to peace
• Evacuations are ongoing in Kursk, where at least 121,000 people have already fled, according to the region's acting governor
• About 200 people who left Kursk arrived in Moscow today, Russia's emergency ministry said
• In Ukraine, Kyiv's chief of staff said movement has been restricted for civilians within a 20km (12 mile) zone bordering Russia
• Meanwhile, the UN's human rights agency said it was concerned over the latest fighting between Russia and Ukraine, and that protecting civilians "must be a top priority"

Stay with us for more.

Some Russian military units fighting in Ukraine are likely experiencing drinking water shortages, according to the UK's Ministry of Defence (MoD) .

Ongoing Russian strikes against utilities infrastructures "is now almost certainly curtailing water supply", it says in its latest update.

The MoD adds that a pro-Russian military blogger reported on 23 July that Russian pilots had been restricted to "one litre [of water] per day" and were approaching local citizens for water.

Frank Gardner
Security correspondent

Ukraine’s foreign ministry has announced it has no intention of permanently holding on to Russian territory it has seized in the last week.

But it still faces a stark choice today: whether to stay put for maximum advantage or to withdraw.

So where does it go from here?

There will be those on the more cautious end of the spectrum who will argue that Ukraine has already made its point, that Putin’s war of choice must now bring some pain to Russians.

That despite recent setbacks on the battlefield in the Donbas region, Ukraine has shown itself capable of mounting a sophisticated, combined arms assault using all the elements of modern warfare.

In other words, withdraw now with honour, having given the Kremlin a bloody nose, before Russia brings in enough forces to kill or capture the invading Ukrainians.

But withdrawal would negate two of the apparent objectives of Ukraine’s incursion, namely to put enough pressure on Russia that it is forced to divert some of its own troops in the Donbas.

And secondly to hold enough Russian territory to use as a bargaining chip in any future peace negotiations.

It’s still too early to tell if it can achieve that effect as the Kremlin will throw everything it can at this problem to rid its soil of the invaders.

Russian TV paints Ukraine incursion as doomed to failpublished at 14:59 British Summer Time 13 August

14:59 BST 13 August

Francis Scarr
BBC Monitoring

A week since Ukrainian troops first crossed the border into Kursk Region, the incursion remains the top story on Russian state TV.

But instead of giving viewers reliable reporting of developments on the ground, the channels are using events to reinforce well-established Kremlin narratives about Ukrainian "aggression".

Russian troops are said to be successfully repelling Ukrainian "attempts" to break through their lines, while the incursion is referred to as an act of "terrorism" against civilians rather than a military response to Russia’s own invasion of Ukrainian territory.

TV channels have been keen to stress the futility of the operation, often using the Russian word "avantyura" to describe it – a hopeless escapade doomed to failure.

Today on the 60 Minutes political talk show, host Olga Skabeyeva claimed that Ukraine was sustaining "colossal losses" with ambulances queuing up across the border waiting for wounded troops evacuated from the battlefield.

Meanwhile, state TV has painted the picture of a country coming together in solidarity, with volunteers rushing to help those forced to leave their homes, and the state offering generous handouts.

This is at odds with some reporting from on the ground, for example by the Kommersant newspaper, where locals claimed the authorities were downplaying the scale of the situation and failing to provide sufficient assistance.

Ukrainian President Volodymyr Zelensky says Russia was met with "a worthy rebuff", after Kyiv's air defence claimed it destroyed 30 of 38 Russian-launched drones overnight.

"Last night, Russian terror once again received a worthy rebuff," Zelensky says on X, adding that "every enemy target destroyed, results in defended lives and protected infrastructure."

"I thank all our warriors who ensure the safety of our skies for their precision. Strengthening our defenders and our ability to repel this Russian terror remains a top priority," he says.

Latest fighting highlights challenges faced by aid agenciespublished at 14:11 British Summer Time 13 August

14:11 BST 13 August

Imogen Foulkes
Reporting from Geneva

The United Nations Human Rights Office has expressed concern about escalating conflict between Russia and Ukraine, following Kyiv's surprise incursion into Russian territory.

A spokesperson said that "wherever military operations are occurring by either side", protecting civilians "in accordance with international humanitarian law must be the top priority". This is what you would expect the UN to say – no less, but no more.

The real question is, what can the UN or other agencies actually do to help civilians caught up in fighting inside Russia?

Since the start of the conflict, aid organisations have had little or no access to Russian-occupied territory, and none on the other side of the border inside Russia.

A proposal by the International Committee of the Red Cross (ICRC) in 2022 to set up an office in southern Russia was met with a storm of protest from Ukraine, where many people were angry that aid agencies might operate inside what they saw as enemy territory.

UN human rights monitors have had great difficulty monitoring alleged violations in Russian occupied zones, relying on testimony from people who have fled west into Ukrainian territory.

The ICRC has not been able to do its job visiting all the Ukrainian prisoners of war held by Russia.

The latest fighting highlights again the challenges faced by the aid agencies – their role is to offer neutral, impartial assistance to civilians, the wounded, and prisoners, but in many of today’s conflicts they cannot.

Ukraine is not interested in "taking territory" in the Kursk region, its foreign affairs ministry says, adding that its offensive there will stop when Russia agrees to peace.

"The sooner Russia agrees to restore a just peace, the sooner Ukrainian raids on Russian territory will stop. As long as Putin continues the war, he will receive such responses from Ukraine," a spokesman tells a briefing in Kyiv.

Ukrainian operations in the region are helping the frontline, he adds, as it prevents Russia from moving additional units to the Donetsk, a Ukrainian region under Russian control.

Russian authorities are continuing to evacuate residents in and around the Kursk region.

On Tuesday morning, people began fleeing the Bolshesoldatsky district for the first time as regional head Vladimir Zaitsev stressed that everyone left on their own accord and there had been no evacuation requests in his region until Monday.

While residents left the nearby Belovsky district on Monday as the head of the Belovsky district, Nikolai Volobuyev, widened evacuation efforts, describing the situation as "very grave".

Also speaking on Monday, the acting governor of the Kursk region Alexei Smirnov said some 121,000 people had been evacuated from their homes.

Image source, RUSSIAN MINISTRY OF EMERGENCY SITUATIONS / HANDOUT

Image source, Reuters

Let's take a look at some of the latest developments in the Russia-Ukraine war, one week after Ukraine's incursion inside Russian territory:

• Around 200 people who have fled the Kursk region arrived in Moscow on Tuesday, according to Russia's emergency ministry
• Ukraine has said it now controls around 1,000 sq km (386 sq miles) of Russian territory in the Kursk region
• But the Institute for the Study of War (ISW) says Kyiv might control closer to 800 sq km
• In the early hours of Tuesday, Ukraine's air defence system shot down 30 Russia-launched drones and this morning it restricted movement for Ukrainian civilians within a 20km (12 mile) zone bordering Russia

• In reaction to the Kursk surprise incursion, Ukraine's President Volodymyr Zelensky said last night that "Russia has brought war to others, and now it is coming home"
• While Russian President Vladimir Putin said Kyiv would receive what he called a "worthy response"

As a reminder, Russia launched its full-scale invasion of Ukraine in February 2022. While Ukraine has launched incursions before, it is the first time regular Ukrainian forces have been used in this way.

Hard to see how Ukraine's offensive will dramatically alter course of warpublished at 12:29 British Summer Time 13 August

12:29 BST 13 August

Jonathan Beale
Defence correspondent

The element of surprise is key to any military campaign.

Ukraine has certainly achieved that with its rapid incursion inside Russia. But without a clear strategy behind the move it's still hard to see how this attack will dramatically alter the course of this war.

Surprises can quickly fizzle out as fast as they started – think of Russia’s renewed offensive on Kharkiv earlier this year or Prigozhin’s march on Moscow last year.

The clearest logic behind Ukraine’s latest move has been provided by President Zelensky who says he wants to "bring the war home" to Russia.

In that sense this attack should not be seen in isolation. Over the past few months Ukraine has also been stepping up its long range strikes inside Russia.

It's part of a long held belief that Russia can only be forced to stop the war when it too feels the pain it's inflicted on Ukraine. The hope that more and more Russians may begin to question the war.

But that's only a hope.

Trying to force Russia to divert more of its forces from the eastern front to protect its own border makes more military strategic sense. But as yet there’s little evidence that Russia has slowed down its assault in the Donbas.

The attack may also have helped boost Ukraine's morale – not just for the troops but a war weary country too. But that’s likely to be as ephemeral as the element of surprise.

Whatever happens, Ukraine may believe that this gamble was worth it. Not least because of the negative impact it will have on President Putin, and the positive effect it’s having inside Ukraine and among its western supporters.

But these won't win the war.

On today's Ukrainecast, you'll hear from BBC Verify's Olga Robinson and BBC Russia editor Steve Rosenberg, who join hosts James Coomarasamy and Vitaly Shevchenko to discuss the latest developments from the conflict.

The team will also speak to a Russian man who is originally from Kursk and who still has family in the area.

You can listen to the episode here.

The UN's human rights agency is concerned about military developments in the war between Ukraine and Russia, Reuters news agency reports.

In response to a question about Ukraine's recent incursion into the Russian Kursk region, a spokesperson says protecting civilians has to be a priority.

"Wherever military operations are occurring by either side, the protection of civilians and civilian objects in accordance with international humanitarian law must be the top priority," the spokesperson adds.

We're now hearing from Russia's emergency ministry, which says around 200 displaced Kursk residents arrived in Moscow on Tuesday.

The Russian capital sits around 526 km (326 miles) away from Kursk.

Evacuations have been ongoing since it was first reported that Kyiv had boots on the ground in the west Russian region earlier this month.

In an update on Telegram, the ministry says that in total more than 940 citizens, most of them children, arrived in the Moscow region.

Around 400 temporary accommodation centres have been set up across Russia to house around 30,000 displaced residents, the ministry adds.