Fraud compounds where scammers lure internet users into fake romantic relationships and cryptocurrency investments have flourished across Southeast Asia, including in the lawless borderlands of Myanmar.

Initially largely targeting Chinese speakers, the criminal groups behind the compounds have expanded operations into multiple languages to steal from victims around the world.

Those conducting the scams are sometimes willing con artists, and other times trafficked foreign nationals forced to work.

In recent years, Beijing has stepped up cooperation with regional governments to crack down on the compounds, and thousands of people have been repatriated to face trial in China's opaque justice system.

The 11 people executed Thursday were sentenced to death in September by a court in the eastern Chinese city of Wenzhou, Xinhua said, adding that the court also carried out the executions.

Crimes of those executed included "intentional homicide, intentional injury, unlawful detention, fraud and casino establishment", Xinhua said.

The death sentences were approved by the Supreme People's Court in Beijing, which found that the evidence produced of crimes committed since 2015 was "conclusive and sufficient", the report said.

Among the executed were members of the "Ming family criminal group", whose activities had contributed to the deaths of 14 Chinese citizens and injuries to "many others".

"The criminals' close relatives were allowed to meet with them before the execution," Xinhua added.

Fraud operations centred in Myanmar's border regions have extracted billions of dollars from around the world through phone and internet scams.

Experts say most of the centres are run by Chinese-led crime syndicates working with Myanmar militias.

The fraud activities and crackdowns by Beijing are closely followed in China.

The September rulings that resulted in Thursday's executions also included death sentences with two-year reprieves to five other individuals.

Another 23 suspects were given prison sentences ranging from five years to life.

In November, Chinese authorities sentenced five people to death for their involvement in scam operations in Myanmar's Kokang region.

Their crimes had led to the deaths of six Chinese nationals, according to state media reports.

The United Nations Office on Drugs and Crime warned in April that the cyberscam industry was spreading across the world, including to South America, Africa, the Middle East, Europe and some Pacific Islands.

The UN has estimated that hundreds of thousands of people are working in scam centres globally.