Ukrainians say they are in danger of losing the drone arms race with Russia and need more help.

And that is worrying not just for Ukraine, because the drone is becoming the likely weapon of choice in other future conflicts.

Sky News has been given exclusive access to a Ukrainian drone factory to watch its start up ingenuity at work. Ukrainians have turned the drone into their most effective weapon against the invaders.

But they are now, we are told, losing the upper hand in the skies over Ukraine.

General Cherry Drones was started by volunteers at the beginning of the war, making a 100 a month, but is now producing 1,000 times that. The company’s Andriy Lavrenovych said it is never enough.

“The Russians have a lot of troops, a lot of vehicles and our soldiers every day tell us we need more, we need more weapons, we need better, we need faster, we need higher.”

The comments echo the words of Ukraine’s leader, President Volodymyr Zelenskyy, who told reporters this week “the Russians have increased the number of drones, while due to a lack of funding, we have not yet been able to scale up.”

The factory’s location is a closely-guarded secret, moved often. Russia strikes weapons factories when it can.

In a nondescript office building we watched drones being assembled and stacked in their thousands. Put together like toys, they are hand assembled and customised.

The quadcopters vary in size, some carry explosives to attack the enemy. Others fly as high as six kilometres to ambush Russian surveillance drones.

A $1,000 (£743) Ukrainian drone can bring down an enemy aircraft worth 300 times as much.

Downstairs each drone is tested before it’s sent to the front. Nineteen-year-old Dima – not his real name – used to play with drones at home before it was occupied in Kherson Oblast.

Now he works here using his skills to check the drones are fit for battle.

But Russia is catching up. Sinister propaganda released this week filmed at one of its vast new drone factories shows hundreds of Geranium delta wing attack drones lined up ready to be launched at Ukraine.

Russia has refined the technology provided by Iranians to produce faster, more lethal versions of their Shahed drones. They have wreaked havoc and carnage, coming in their hundreds every night and killing scores of civilians. Ukraine expects 1,000 a night in the months ahead.

Russia is using scale and quantity to turn the tables on Ukrainians. And it is mastering drones controlled by fibre optic thread, trailing in their wake, that cannot be jammed.

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Oleksandr “Drakar”, head of new product development, showed us his company’s prototype fibre optic model. It is more effective than the Russians, he told us, but added: “The Russians began using the technology earlier and have scaled up production.

“They’ve had considerable help from the Chinese – entire factories there are under contract to supply fibre exclusively to Russia, producing it in vast quantities.”

Russia’s Chinese allies, who claim to be neutral in this conflict, are also throttling the supply of microchips and other parts vital to drone production. The West is not doing enough, say Ukrainians, to counterbalance the threat.

It is a constant race to beat the other side, innovation met by more innovation. This conflict is revolutionising warfare into a sci-fi battle of machines.

Ukrainians say 80% of battlefield strikes are now carried out by drones.

Whoever has the upper hand with them in this conflict is likely to have the edge in future wars. If the West wants to be on the winning side, it will need to give Zelenskyy and his drone start-up companies more help to maintain their edge.

It is an innocuous term for a horrible tactic. A “double tap” sounds so innocent and unthreatening. In fact, it is a term saved for a particularly brutal kind of attack.

And so it seems was the fate of those who died in the Nasser hospital in Khan Younis, Gaza. First one strike hit the building, ripping away a chunk of the wall and injuring the people inside.

Fifteen minutes later, as rescuers and journalists rushed in, and as the scene was being broadcast live, a second explosion ripped through the courtyard, killing those who had come to help.

Latest updates: Israel strikes Nasser hospital

So the first tap causes harm and brings people to the scene; the second inflicts yet more devastation upon the people who came to help.

It’s a tactic that’s been used by a variety of countries over the years, most recently by Russia in Ukraine and, enthusiastically, by Bashar al Assad while he was president of Syria.

This time, it left more than 20 people dead, among them medics, patients, and five journalists. The scenes of carnage were horrendous – we saw images of death and destruction. One man, a journalist who survived the explosions, was filmed sitting in the hospital, his head and body soaked in blood, utterly dazed.

Nasser is the last fully functioning hospital in southern Gaza. To see it struck again was, in the words of British surgeon Professor Nick Maynard, “barbarism in the extreme”.

He told Sky News: “This hospital has been bombed several times over the last 22 months. It is murder. These are war crimes killing innocent civilians. As barbaric as anything I have seen in Gaza.”

Among the dead was photographer Mariam Daqqa. Hours before her death, her name appeared on the front page of a leading Israeli newspaper, a credit for a haunting photo she had taken of an emaciated child.

Her press vest, recovered from the rubble, was later laid across her coffin while her camera, still marked by her own blood, was held aloft.

Amanda Nasser, an American emergency nurse who had been working inside the hospital, survived by chance. “We were told to leave for [a] training session,” she said. “Thirty minutes later, the hospital was hit twice. Mariam was a dear friend. Getting that news broke me down.”

Israeli Prime Minister Benjamin Netanyahu has described the attack as “a tragic mishap” and an investigation has been opened. The Israel Defence Forces (IDF) insists it does not deliberately target civilians; Mr Netanyahu says that Israel values the work of “journalists, health workers and all citizens”.

But it’s also a fact that Nasser hospital is a popular place for media workers to gather, to use the internet and to chase and trade stories. And if we know that, so does the Israeli military.

It would be naive to think that the chance of killing journalists, as well as, obviously, health workers, was not obvious to those who launched this attack. “We do not intentionally target civilians,” says the IDF’s spokesperson Effie Defrin. “We regret any harm to uninvolved individuals.”

And yet, somehow, it happened. Not just one explosion, but two.

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There are at least five different groups who try to keep track of how many journalists have been killed in Gaza. They all come up with different figures, but they agree that the total is above 200, and may even be more than 300.

And remember – foreign journalists are barred from entering Gaza, so the ability of the world to scrutinise what is actually happening on the ground in Gaza is largely dependent upon the work of these people, hundreds of whom are now dead.

Israel may not be targeting them, but it is certainly killing a lot of journalists along the way.

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This is a crucial moment in this conflict. Parts of Gaza have been designated as suffering from famine, just as Israel’s military might is readied for a huge operation to encircle and overwhelm Gaza City.

A ceasefire proposal is on the table, but Netanyahu seems reluctant to negotiate. On Tuesday, once again, Israel will face protests and strikes from those, including the families of hostages, demanding that their prime minister stop the war.

It is a volatile time, and Israel is a volatile country.

Israeli strikes on a hospital in southern Gaza have killed at least 20 people, including five journalists, according to the Gaza health ministry and the media organisations the journalists worked for.

Nasser Hospital in Khan Younis was struck twice on Monday in what has been described as a “double-tap” attack.

The initial strike hit the top floor of a building at Nasser Hospital. Minutes later, as journalists and rescue workers rushed to the scene, a second missile struck the same location, according to Dr Ahmed al Farra, head of the hospital’s paediatrics department.

Al Jazeera, the Associated Press (AP), and Reuters said their journalists were among those killed.

Israeli Prime Minister Benjamin Netanyahu said he “deeply regrets” the incident, calling it a “tragic mishap”.

“Israel values the work of journalists, medical staff, and all civilians,” he added. “The military authorities are conducting a thorough investigation.”

A British consultant surgeon, who worked at the Nasser Hospital earlier this summer, described the attack on Monday morning as “barbarism in the extreme”.

Consultant surgeon Professor Nick Maynard told Sky News it was a “typical double strike that the Israelis use frequently”. It targets an area, then hits it shortly afterwards, often when emergency services respond, he explained.

The Israeli military said its troops carried out a strike in the area of Nasser Hospital in Khan Younis and that it would conduct an investigation into the incident. The military said it “regrets any harm to uninvolved individuals and does not target journalists as such”.

In a further statement, Israel Defense Forces (IDF) spokesman Effie Defrin said: “We are aware of reports that harm was caused to civilians, including journalists. I would like to be clear from the start – the IDF does not intentionally target civilians.

“The IDF makes every effort to mitigate harm to civilians, while ensuring the safety of our troops.”

He said forces were “operating in an extremely complex reality” and that Hamas “deliberately use civilian infrastructure, including hospitals, as shields”.

He said the findings of Israel’s investigation will be presented “as transparently as possible”.

Who are the journalists?

Mariam Dagga, 33, a visual journalist who freelanced for AP during the war, as well as other news outlets, was killed in Monday’s strike.

AP said in a statement that it was shocked and saddened by the death of Dagga and the loss of other journalists.

Dagga, a mother of a 12-year-old son who was evacuated from Gaza earlier in the war, frequently based herself at Nasser, the news agency said. Most recently, she reported on the hospital’s doctors struggling to save starving and malnourished children.

“We are doing everything we can to keep our journalists in Gaza safe as they continue to provide crucial eyewitness reporting in difficult and dangerous conditions,” AP said.

Independent Arabia, the Arabic-language edition of The Independent, said it also collaborated with Dagga.

Al Jazeera confirmed cameraman Mohammed Salama was among those killed.

Mohamed Moawad, managing editor of Al Jazeera, spoke to Sky News from Doha, Qatar, after Mr Salama was killed.

“They were reporting closer to the hospital, knowing that was somehow safer than the frontline,” he said. “We’re talking about a crime against journalism.”

Reuters said in a statement that it was “devastated” after two of its journalists were killed at the Nasser Hospital, and one was injured.

Contractor cameraman Hussam al Masri was also killed in the strikes on Nasser Hospital, Reuters said.

Moaz Abu Taha, a freelance journalist whose work had been occasionally published by Reuters, was also killed. Photographer Hatem Khaled, a Reuters contractor, was wounded.

A fifth journalist, Ahmed Abu Aziz, who worked as a freelance reporter, succumbed to his wounds following the strikes at the Nasser Hospital.

One of the bloodiest conflicts for media workers

The Israel-Hamas war has been among the deadliest conflicts for journalists, with the Committee to Protect Journalists (CPJ) reporting at least 192 media workers killed in Gaza during the 22-month-long conflict.

The CPJ says that 18 journalists have died so far in Russia’s war in Ukraine.

Thibaut Bruttin, director general of Reporters Without Borders, said press freedom advocates have never witnessed such a significant decline in journalist safety. He said journalists had been killed in both indiscriminate bombings and deliberate attacks.

“They are doing everything they can to silence independent voices that are trying to report on Gaza,” said Mr Bruttin.

Israel has accused journalists in Gaza of ties to militant groups, as in the case of Al Jazeera correspondent Anas al Sharif, who was targeted and killed by Israeli forces earlier this month.

The Israeli military claimed Sharif led a Hamas cell, a charge both Al Jazeera and Sharif rejected as unfounded.

In the absence of direct access, news organisations largely depend on Palestinian journalists and local residents in Gaza to document and provide first-hand accounts of the events unfolding on the ground.

Many journalists reporting from Gaza are enduring the same hardships as those they cover, including the daily struggle to secure food for themselves and their families.

“It is a particular burden that they carry, as well as living in a war zone,” Sky Middle East correspondent Adam Parsons said.

Additional casualties on Monday

In addition to the casualties at Nasser Hospital, medical officials in northern Gaza reported further fatalities resulting from strikes and gunfire along routes leading to aid distribution sites.

According to Shifa Hospital in Gaza City, an airstrike on a neighbourhood claimed the lives of three Palestinians, including a child.

Al Awda Hospital in Deir al Balah reported six people attempting to reach a central Gaza aid distribution point were shot and killed in Israeli gunfire. The hospital said 15 others were wounded in the incident.

The IDF has previously “strongly rejected” accusations it targets civilians – and maintained its forces operate near aid sites to stop supplies from falling into the hands of militants.