The Chinese spy who hunted on LinkedIn

Jun Wei Yeo, an ambitious and freshly enrolled Singaporean PhD student, was no doubt delighted when he was invited to give a presentation to Chinese academics in Beijing in 2015.

His doctorate research was about Chinese foreign policy and he was about to discover firsthand how the rising superpower seeks to attain influence.

After his presentation, Jun Wei, also known as Dickson, was, according to US court documents, approached by several people who said they worked for Chinese think tanks. They said they wanted to pay him to provide "political reports and information". They would later specify exactly what they wanted: "scuttlebutt" - rumours and insider knowledge.

He soon realised they were Chinese intelligence agents but remained in contact with them, a sworn statement says. He was first asked to focus on countries in South East Asia but later, their interest turned to the US government.

That was how Dickson Yeo set off on a path to becoming a Chinese agent - one who would end up using the professional networking website LinkedIn, a fake consulting company and cover as a curious academic to lure in American targets.