Image copyrightDICKSON YEO/FACEBOOKDickson Yeo

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.



PhD students ...