North Korea says it will support Russia in its war with Ukraine “until the day of victory” – after the US warned thousands of Pyongyang’s troops are set to enter combat in the coming days.

North Korea’s foreign minister Choe Son Hui hailed Vladimir Putin’s “wise leadership” ahead of talks in Moscow on Friday, and insisted that Russia will “achieve a great victory”.

“We also assure that until the day of victory we will firmly stand alongside our Russian comrades,” she added.

US secretary of state Antony Blinken has said thousands of North Korean troops are stationed near Ukraine’s border and are set to enter combat in the coming days.

Mr Blinken said 10,000 soldiers have been deployed to Russia, with up to 8,000 in the Kursk border region, and indicated they would be used on the frontline.

He added that the troops have been trained by Russian forces in artillery, drones and “basic infantry operations, including trench clearing”.

In an interview with South Korean TV channel KBS, Ukrainian President Volodymyr Zelenskyy condemned the West’s response to the deployment as “nothing, it’s zero”.

Russia’s foreign minister Sergei Lavrov told reporters on Friday that he had “nothing to add to what has already been said” on the US claims, and thanked Ms Choe for North Korea’s support.

The deployment of troops to Russia comes after Mr Putin met Kim Jong Un in June, when the Russian president travelled to North Korea for the first time in 24 years.

A mutual defence pact was agreed during their summit, meaning the countries will help each other if they are attacked.

Speaking in Moscow, Ms Choe accused the US and South Korea of plotting a nuclear strike against her country.

She provided no evidence to back her claim, but spoke of regular consultations between Washington and Seoul, at which she alleged such plotting took place.

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Ms Choe also told Mr Lavrov that tensions on the Korean Peninsula could turn “explosive” at any moment.

On Thursday, North Korea tested a new intercontinental ballistic missile, which it claimed was “the world’s most powerful strategic deterrent”.

On Friday, Ukraine’s air force said it shot down 31 Russian drones and one missile during an overnight strike across the country.

It said 48 drones were launched by Moscow, along with three cruise missiles. Out of the drones launched, another 14 were “locationally lost”.

More than 200 people have died in Spain after nearly a year’s worth of rain fell in a matter of hours.

On Friday, there were at least 205 confirmed deaths in Valencia, two in Castilla La Mancha, and one in Andalusia.

Local authorities issued warnings late on Tuesday, but many say this gave them next-to-no time to prepare for the conditions that had killed dozens by Wednesday.

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Here we look at what caused the flooding – and why they could happen again.

How quickly did the floods hit?

Heavy rain had already begun in parts of southern Spain on Monday.

In contrast to areas like Malaga, where residents told Sky News it had been “chucking it down for two days”, the rain did not start in the worst-hit region of Valencia until around 7pm on Tuesday.

At 8pm, people in Valencia received smartphone alerts warning them not to leave their homes.

But by then, many were already trapped in dangerous conditions, particularly in the south of the city where a major road had flooded, leaving drivers stuck in their cars.

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By Wednesday morning, more than 50 people had been found dead.

The Chiva area of Valencia had been hit by 491 litres per square metre of rain in eight hours. Only around 65 l/m2 usually falls in the whole of October.

Storms spread west on Wednesday night and into Thursday, bringing deadly conditions to Andalusia and Castilla La Mancha as well.

What caused them?

Heavy rain is not uncommon across eastern Spain at this time of year.

It’s caused by a weather phenomenon called DANA – ‘depresion aislada en niveles altos’ in Spanish – which translates as ‘isolated low-pressure system at high levels’.

DANA occurs when:

1) Cold air from the north moves south;

2) Warm air then blows over the Mediterranean, rising quickly and forming heavy clouds;

3) The low pressure from the north gets blocked by the high pressure above the water, causing it to slow down or stop completely.

This creates storm-like conditions that cannot move anywhere else – so the rain falls over the same area for a sustained period of time.

What role did climate change play?

General flash floods and those caused by DANA specifically have struck Spain long before humans started warming the climate.

But climate change is making heavy rain worse, and therefore more dangerous.

That’s because hotter air is able to hold more moisture. So when it rains, it unleashes more water.

The current 1.3C increase in global temperatures since pre-industrial times means the air can carry about 9% more moisture.

And higher sea surface temperatures in the Mediterranean are a “key driver” of strong storms, said Dr Marilena Oltmanns, research scientist at the National Oceanography Centre in Southampton.

The world is on track for 3.1C warming by the end of this century, which is expected to make rain heavier still, increasing the chances of flash flooding and giving areas little time to respond.

Imperial College London’s lead for its World Weather Attribution (WWA) group Dr Friederike Otto says there is “no doubt about it”.

“These explosive downpours were intensified by climate change,” she says.

Professor Mark Smith, an expert in water science and health at the University of Leeds, adds that hotter summers also dry out the soil in the ground, which means it absorbs less rain – and more of it flows into rivers and lakes – which flood quicker.

Will they keep happening?

A red weather warning is in place for the Huelva area of Andalusia until Friday afternoon.

Beyond the warning period, storms are set to continue across parts of Spain for several days.

In the longer term, Dr Marilena Oltmanns says: “Given the long-term warming trend, both in the sea surface temperatures in the Mediterranean region and the global air temperature, we expect the events like the currently observed one in Spain to become more frequent.”

Chiva and the surrounding worst-hit area also suffers from the unfortunate geography of being in a river catchment – where water feeds into the River Turia – and close to the mountains. And is not far from the sea.

That means water has little chance to absorb into the land and so builds up very quickly.

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This makes it all the more imperative that forecasts are accurate, authorities prepare accordingly, and residents respond quickly.

Professor Hannah Cloke, professor of Hydrology at the University of Reading, describes people dying in their cars and being swept away in the street as “entirely avoidable”.

“This suggests the system for alerting people to the dangers of floods in Valencia has failed,” she says.

“People need to understand that extreme weather warnings for floods are very different from regular weather reports. We need to consider flood warnings totally differently, more like fire alarms or earthquake sirens, and less like the way we browse daily weather forecasts on our phones or on the TV.”

Gareth Redmond-King, international analyst at the Energy & Climate Intelligence Unit (ECIU), says Spain’s tragedy should serve as a “wake-up call” to the UK.

“This is not about future events in a far-off place with a dramatically different climate from the UK. Spain is one of our nearest neighbours,” he warns.

Survivors of the devastating Spanish floods have told Sky News they feel lucky to be alive.

But they are angry that they have not been given more support by the government, emergency services or the military.

They say they feel forgotten and have been left without power, food or water, despite living within a short drive of one of the biggest cities in Spain.

Instead, we have seen thousands of volunteers helping to clear up some of the towns that were devastated, while others have been left to rely on their own residents to deal with the extraordinary devastation.

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“Tell the world that we have nothing,” says one man as we talk in the town of Albal. There are growing calls for a nationwide protest against what is seen as the slow response of authorities.

But there are also mesmerising stories of survival. In Catarroja, we meet Arkait Iniguez, who returned from his high school in Valencia because of a warning of bad weather.

“At first I was in the water up to my knee,” he says. He wanted to check on his grandmother, who lived nearby, but by the time he had reached her house, the water was rushing so fast that it swept him away.

“The stream was so fast and the level rose. I grabbed the post of a traffic sign so I wouldn’t get taken away. Some neighbours tried to help me – they threw me a rope, but it broke.

“I was there for 20 minutes. Something hit me – I think it was a car, but I can’t be sure. And then the stream got less strong and I could jump on to a car.”

Mr Iniguez was there for hours until he could wade through the water to get to safety.

It is a terrifying story, and the deep cuts on his back are testimony to what happened.

He said: “I thought I might die but I also thought to myself ‘this is not how it should end’.”

As we talk, the road is being washed down by the residents, who have worked relentlessly since the morning. “It is the best road in the town,” says one man. Civic pride, it seems, can survive anything.

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Across this region, we saw thousands upon thousands of people volunteering to help get these towns back towards some kind of functionality. We saw huge, snaking lines of people, holding brooms and brushes, an army of helpers.

What we didn’t see was much sign of the actual army.

Walking through the town of Aldaia, which was swamped with mud and debris, there was frenetic and determined work going on. But all of it from volunteers – many of them young people in their late teens or early 20s.

Nor did we see much of the emergency services.

No doubt they are stretched – and nobody can be fully prepared for a disaster on this level, but the fact is that, when you travel round these beleaguered, battered towns, the impression you get is that all the work is being done by amateurs, while the professionals are largely absent.

Rebuilding will be a colossal job. The physical scars of these floods will last for many years, and so will the emotional ones.

We first see Father Francisco when he is comforting people in the street. His shirt is splattered with mud.

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No, he says, this disaster has not shaken his faith, but it has shaken his emotions. He is close to tears as we talk – exhausted, like his parishioners.

“I would say the main word is shock. We are in shock and you can see the reality has surpassed fiction. This is a horror film, but even more than that.

“This natural catastrophe is worse than a horror movie.”