Representatives of dozens of climate-sensitive islands and African nations have stormed out of high-stakes negotiations on a climate finance target.

Patience is running out and tensions have boiled over at the COP29 climate talks in Azerbaijan, which were due to end yesterday but are now well into overtime.

After two weeks of fraught diplomacy, the more than 190 countries gathered in the capital Baku are still trying to agree a new financial deal to channel money to poorer countries to both slow and adapt to climate change.

The least developed countries like Mozambique and low-lying island nations like Samoa are furious at their calls to have ignored part of the fund allocated to them.

Samoa’s Minister of Natural Resources and Environment Toeolesulusulu Cedric Schuster is one of the representatives who walked out of financial discussions.

“We’re here to negotiate but we’ve walked out… at the moment we don’t feel like we’re being heard in there,” he said on behalf of more than 40 small island and developing nations, whose coastlines are being lost to rising sea levels.

Soon after, he made a veiled threat to leave COP29 altogether, saying: “We would like nothing more than to remain engaged, but the process must be INCLUSIVE.

“If this cannot be the case, it will be very difficult for us to continue our engagement here at COP29.”

Evans Njewa, who chairs a group of more than 40 least developed countries, said the current deal is “unacceptable to us. We need to talk to other developing countries and decide what to do.”

The latest official draft on Friday pledged $250 billion a year annually until 2035.

This is more than double the previous goal of $100 billion set 15 years ago, but nowhere near the annual $1.3 billion that experts say is needed.

Sky News understands that this morning some developed countries such as Britain were willing to raise the target to $300 billion.

But a group of 77 developing countries negotiating as a bloc appears unwilling to accept anything lower than $500 billion.

Developing countries are angry not only over the financial negotiations, but also over how to make progress on a pledge made last year to “divert fossil fuels”.

A group of oil and producing countries, led by Saudi Arabia, has sought to water down that language, while Britain and the island nation are among those who have fought to preserve it.

Mr Schuster said all the items being negotiated contained a “deplorable lack of substance”.

He added: “We need to see progress and follow through on the transition away from fossil fuels that we agreed on last year. We have been asked to forget all about it at this COP, as if we are not in a critical decade and as if 1 “The 5C limit is not in danger.”

“We must show the consideration that our difficult circumstances require.”