UN climate talks are “no longer fit for purpose” and should only be hosted by countries who are trying to give up fossil fuels, veterans of the process have said.

An open letter to the United Nations, signed by former UN chief Ban Ki-moon, made a dramatic intervention in the 29th COP climate summit, under way in Baku, Azerbaijan.

Frustration over petrostate hosts – following last year’s summit in UAE – as well as the influence of fossil fuel lobbyists, prohibitive costs, and slow progress have been mounting in recent years.

The letter acknowledges the strides COPs have made on ramping up climate policies.

“But it is now clear that the COP is no longer fit for purpose,” the authors said.

“Its current structure simply cannot deliver the change at exponential speed and scale, which is essential to ensure a safe climate landing for humanity.”

The letter’s 22 signatories also include former Ireland President Mary Robinson and Christiana Figueres, former head of the UN climate body (UNFCCC) that runs the annual COP summits.

It called for the process to be streamlined and for countries to be held accountable for their promises.

Sky News analysis has found only “marginal” progress has been made since the “historic” pledge from COP28 last year to transition away from fossil fuels.

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The letter also called for “strict eligibility criteria” for host countries to exclude those “who do not support the phase out/transition away from fossil energy”.

This year’s host country, petrostate Azerbaijan, has been engulfed in controversy.

Its authoritarian president Ilham Aliyev used his opening address to criticise western hypocrisy and praise oil and gas as a “gift” from God. His criticism of France, with whom relations have long been tense, drove the French minister to cancel a trip to the summit.

While the government and its COP team run separate operations, host countries are supposed to smooth over disagreements and find consensus between the almost 200 countries gathered.

COP presidencies are also nominating themselves to be climate leaders and throwing their own countries under the spotlight.

Azerbaijan is a small developing country that relies significantly on oil and gas revenues. But it has made slow progress on building out clean power – getting just 1.5% of its energy from clean sources – and led a harsh crackdown on critics in the run up to the COP.

In an interview with Sky News on Sunday, its lead negotiator Yalchin Rafiyev was unable to say whether Azerbaijan preferred to extract all its oil and gas or seek another, cleaner economic pathway – hard though that would be.

In a news conference yesterday, Mr Rafiyev said the president had been “quite clear” and he would not comment further.

“We have opened our doors to everybody,” he added.

Some diplomats here have hinted that Azerbaijan’s presidency team mean well but might be a little out of their depth. They have never been out in front at previous COPs, but they also only had a year to prepare for their turn hosting the mighty summit.

“My sense of this is that they’re a little underprepared, a little overwhelmed and a little bit short,” said one, speaking anonymously, as is customary for diplomats trying to maintain good relations.

“But I’m not sure that that’s politics. It might just be bandwidth and preparation and things like that.”

Different regions in the world take turns to host a COP. This year it was up to Eastern Europe, but the selection process took longer than usual due to tensions over Russia’s war in Ukraine and between Azerbaijan and rival Armenia.

Achim Steiner of the UN Development Programme, called it “troubling” that some countries face questions over their host roles.

“Are there countries that are by definition good hosts and others are bad hosts?” he asked.

“In the United Nations, we maintain the principle of every nation, first of all, should have a right to be heard.

“Labels are not always the fairest way of describing a nation. Some of the largest oil producers have hosted this COP in the past, and seemingly this seemed to be a perfectly acceptable phenomenon.”

COP stands for “conference of the parties” and refers to countries (“parties”) who have signed the underlying climate treaty.

Azerbaijan’s COP29 team and the UN’s climate body have been contacted with a request to comment.

A body has been recovered from a South African mine after police cut off basic supplies in an effort to force around 4,000 illegal miners to resurface.

The body has emerged from the closed gold mine in the northwest town of Stilfontein a day after South Africa’s government said it would not help the illegal miners.

Around 20 people have surfaced from the mineshaft this week as police wait nearby to arrest all those appearing from underground.

It comes a day after a cabinet minister said the government was trying to “smoke them [the miners] out”.

The move is part of the police’s “Close the Hole” operation, whereby officers cut off supplies of food, water and other basic necessities to get those who have entered illegally to come out.

Local reports suggest the supply routes were cut off at the mine around two months ago, with relatives of the miners seen in the area as the stand-off continues.

A decomposed body was brought up on Thursday, with pathologists on the scene, police spokesperson Athlenda Mathe said.

It comes after South African cabinet minister Khumbudzo Ntshavheni told reporters on Wednesday that the government would not send any help to the illegal miners, known in the country as zama zamas, because they are involved in a criminal act.

“We are not sending help to criminals. We are going to smoke them out. They will come out. Criminals are not to be helped; criminals are to be prosecuted. We didn’t send them there,” Ms Ntshavheni said.

Senior police and defence officials are expected to visit the area on Friday to “reinforce the government’s commitment to bringing this operation to a safe and lawful conclusion”, according to a media advisory from the police.

In the last few weeks, over 1,000 miners have surfaced at various mines in South Africa’s North West province, where police have cut off supplies.

Many of the miners were reported to be weak, hungry and sickly after going for weeks without basic supplies.

Illegal mining remains common in South Africa’s old gold-mining areas, with miners going into closed shafts to dig for any possible remaining deposits.

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The illegal miners are often from neighbouring countries, and police say the illegal operations involve larger syndicates that employ the miners.

Their presence in closed mines has also created problems with nearby communities, which complain that the illegal miners commit crimes ranging from robberies to rape.

Illegal mining groups are known to be heavily armed and disputes between rival groups sometimes result in fatal confrontations.

In the courtyard of a farmhouse now home to soldiers of the Ukrainian army’s 47th mechanised brigade, I’m introduced to a weary-looking unit by their commander Captain Oleksandr “Sasha” Shyrshyn.

We are about 10km from the border with Russia, and beyond it lies the Kursk region Ukraine invaded in the summer – and where this battalion is now fighting.

The 47th is a crack fighting assault unit.

They’ve been brought to this area from the fierce battles in the country’s eastern Donbas region to bolster Ukrainian forces already here.

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Captain Shyrshyn explains that among the many shortages the military has to deal with, the lack of infantry is becoming a critical problem.

Sasha is just 30 years old, but he is worldly-wise. He used to run an organisation helping children in the country’s east before donning his uniform and going to war.

He is famous in Ukraine and is regarded as one of the country’s top field commanders, who isn’t afraid to express his views on the war and how it’s being waged.

His nom de guerre is ‘Genius’, a nickname given to him by his men.

‘Don’t worry, it’s not a minefield’

Sasha invited me to see one of the American Bradley fighting vehicles his unit uses.

We walk down a muddy lane before he says it’s best to go cross-country.

“We can go that way, don’t worry it’s not a minefield,” he jokes.

He leads us across a muddy field and into a forest where the vehicle is hidden from Russian surveillance drones that try to hunt both American vehicles and commanders.

Sasha shows me a picture of the house they had been staying in only days before – it was now completely destroyed after a missile strike.

Fortunately, neither he, nor any of his men, were there at the time.

“They target commanders,” he says with a smirk.

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‘The world is scared of Russia’

It takes me a moment or two to realise we are only a few steps away from the Bradley, dug in and well hidden beneath the trees.

Sasha tells me the Bradley is the finest vehicle he has ever used.

A vehicle so good, he says, it’s keeping the Ukrainian army going in the face of Russia’s overwhelming numbers of soldiers.

He explains: “Almost all our work on the battlefield is cooperation infantry with the Bradley. So we use it for evacuations, for moving people from one place to another, as well as for fire-covering.

“This vehicle is very safe and has very good characteristics.”

Billions of dollars in military aid has been given to Ukraine by the United States, and this vehicle is one of the most valuable assets the US has provided.

Ukraine is running low on men to fight, and the weaponry it has is not enough, especially if it can’t fire long-range missiles into Russia itself – which it is currently not allowed to do.

If President-elect Donald Trump cuts the supply of military aid, the Ukrainians will lose – it’s that simple.

Sasha says: “We have a lack of weapons, we have a lack of artillery, we have a lack of infantry, and as the world doesn’t care about justice, and they don’t want to finish the war by our win, they are afraid of Russia.

“I’m sorry but they’re scared, they’re scared, and it’s not the right way.”

Like pretty much everyone in Ukraine, Sasha is waiting to see what the US election result will mean for his country.

He is sceptical about a deal with Russia.

“Our enemy only understands the language of power. And you cannot finish the war in 24 hours, or during the year without hard decisions, without a fight, so it’s impossible. It’s just talking without results,” he tells me.

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‘Losing will be not only our problem’

These men expect the fierce battles inside Kursk to intensify in the coming days.

Indeed, alongside the main supply route into Kursk, workers are already building new defensive positions – unfurling miles of razor wire and digging bunkers for the Ukrainian army if it finds itself in retreat.

Sasha and his men are realistic about support fatigue from the outside world but will keep fighting to the last if they have to.

“I understand this is only our problem, it’s only our issue, and we have to fight this battle, like we have to defend ourselves, it’s our responsibility,” Sasha said.

But he points out everyone should realise just how critical this moment in time is.

“If we look at it widely, we have to understand that us losing will be not only our problem, but it will be for all the world.”

Stuart Ramsay reports from northeastern Ukraine with camera operator Toby Nash, and producers Dominique Van Heerden, Azad Safarov, and Nick Davenport.