Thai Prime Minister Paetongtarn Shinawatra is facing mounting pressure to resign following a leaked phone call with Cambodian ex-dictator Hun Sen.

Paetongtarn - daughter of former Man City owner Thaksin Shinawatra - was heard in the 17-minute audio recording discussing a recent border dispute that has strained ties between the two Southeast Asian nations.

The Thai premier reportedly adopted an obsequious tone, calling Hun Sen 'uncle' as she blamed a rogue Thai army general for the rising territorial tensions.

She allegedly said through a translator present during the call: ‘I don't want you to listen to our opponents like the commander of the Second Army Region because he is a man of the opponents. After hearing what he said, I don't want you to be upset or frustrated because actually it is not our intention.

‘He wanted to look smart. So, what he said was not beneficial to the nation.'

She also reportedly promised Hun, who lost an eye fighting the Khmer Rogue in the 1970s, to 'take care of anything he wants'.

The call, which happened on Monday, was leaked on Facebook by the former Cambodian leader himself on Wednesday.

Immediately after, Paetongtarn held a press conference to defend the conversation. She admitted the clip was authentic, adding it was a 'negotiation technique' to appease Hun Sen's wrath.

She said: 'I tried to calm Mr Hun Sen using an off-the-record approach in a private conversation. The talking technique should not have been revealed. I feel that I have the goal to maintain national peace. I used soft words.'

Lieutenant General Boonsin Padklang, the army commander mentioned in the call, said he harbored no grudges against Paetongtarn. He said: 'I understand. There's nothing.'

Despite Paetongtarn's attempts to quell public fury, Thailand's coalition government is now on the brink of collapse as a key member, the Bhumjaithai Party, announced it was withdrawing from the alliance.

In a statement, the party said: 'Bhumjaithai party calls on Paetongtarn to show responsibility for her actions that have made the country, people and army lose dignity.'

The departure leaves Paetongtarn's Pheu Thai party with barely enough votes to form a majority. Thailand may hold another snap election, just two years after the last one in May 2023, if another party decides to pull out of the ruling coalition.

Opposition leader Natthaphong Ruengpanyawut has also called on Paetongtarn to dissolve parliament over her alleged mishandling of the border conflict.

He said in a statement: 'This is to return the power to the people and prevent some groups from using this mistake to create situations that will hurt our democratic system.

Tensions between the two countries have intensified following a deadly clash between their troops in a disputed area of Ubon Ratchathani, on May 28.

The skirmish killed a Cambodian sergeant. Thailand said it was committed to resolving the dispute conflict through bilateral means, while Cambodia has vowed to bring the case before the International Court of Justice in The Hague.

Thailand and Cambodia have a fractious history. The Khmer Empire once stretched across much of Southeast Asia before the ancient leaders moved their base south to Phnom Penh in the 16th century amid water shortages.

Thai tribes used it as a chance to encroach and claim much of the deserted land, including priceless sandstone temples and artefacts.

In the 1970s, Thailand supported the Khmer Rouge while they carried out one of the world's worst ever genocides. The country then provided sanctuary for the group's murderous leaders, even allegedly stealing aid funds that were intended to rebuild Cambodia.