The visit by Liu Zhongyi, China's vice minister of public security and commissioner of the Criminal Investigation Bureau, was part of a stepped-up effort by the three countries to address the online scam problem, Thailand's Deputy Prime Minister Phumtham Wechayachai told reporters.
Areas of Myanmar bordering Thailand have been serving as havens for criminal syndicates employing thousands of people from Southeast Asia and elsewhere who help carry out online scams including false romantic ploys, bogus investment pitches and illegal gambling schemes.
Such scams have cost victims around the world tens of billions of dollars, while the people recruited to carry them out have often been tricked into taking the jobs under false pretences and find themselves trapped in virtual slavery.
Last week, some 260 people from 20 nations, including many from Africa, crossed from Myanmar into Thailand after they were reportedly rescued from scam centres.
On a visit to China in early February, Thai Prime Minister Paetongtarn Shinawatra vowed along with China's leader Xi Jinping to crack down on the scam networks.
Just ahead of her visit, Thailand cut off electricity, internet and gas supplies to several areas in Myanmar along the border, citing national security and severe damage that Thailand has suffered from scam operations.
The repatriations of foreign workers from Myanmar have been organised by the Border Guard Force in Myawaddy, a militia of the Karen ethnic minority that exercises control over the area.
However, critics have accused it of being involved in the criminal activities, at least to the extent of providing protection to the scam centres.
The group's leader, Saw Chit Thu, denied in a news conference on Monday that his group was involved in scam activities, but acknowledged business links to some properties hosting the centres, which he said initially operated simply as resorts.
Thai media reported last week that Thailand's Department of Special Investigation was considering seeking arrest warrants for Chit Thu and others for alleged human trafficking.
Thai officials have said as many as 7000-10,000 more people may be repatriated, but Phumtham cautioned that Thailand would only receive those that are ready to be taken back right away by their home countries.
The Bangkok Post newspaper reported that an initial batch of about 600 Chinese nationals from scam centres are expected to be flown back to China on chartered flights when Liu concludes his visit.
Liu visited the border areas in Thailand's Tak province on Monday and appeared in Myawaddy in Myanmar, apparently at a location where hundreds of people believed to have been rounded up from several scam centres are being held awaiting repatriation.
Video of Liu's visit showed hundreds of people there sitting on the ground with their belongings in a large open-walled hall.
"China is actively conducting bilateral and multilateral cooperation with Thailand, Myanmar, and other countries, taking comprehensive measures to address both the symptoms and root causes, and working together to block criminals from committing crimes in relevant countries," Chinese Foreign Ministry spokesperson Guo Jiakun said in Beijing.
"This is part of our joint efforts to eradicate the scourge of online gambling and telecom fraud, and to maintain the safety of people's lives and property and the order of exchanges and cooperation among regional countries."
Dramatic stories of Chinese people being lured to work in Thailand only to be trafficked into a scam compound in Myanmar spread widely on social media in China, causing alarm and denting Thailand's reputation as a safe destination for Chinese visitors.
Among those trapped was Chinese actor Wang Xing, who arrived in Thailand on a promise of getting a job and was abducted to Myanmar.
He was quickly rescued after the incident circulated on social media.
An earlier crackdown on scam centres in Myanmar was initiated in late 2023, after China expressed embarrassment and concern over illegal casinos and scam operations along its border in Myanmar's northern Shan state.
