[2] On September 5, 2019, Geng Shuang confirmed that Cong would serve as Chinese Ambassador to Canada.
[citation needed] On 15 October 2020, during an online press conference, Cong said "So if the Canadian side really cares about the stability and prosperity in Hong Kong, and really cares about the good health and safety of those 300,000 Canadian passport holders in Hong Kong, and the large number of Canadian companies operating in Hong Kong SAR, you should support those efforts to fight violent crimes."
"[3] On 24 September 2021, Cong accompanied Huawei's deputy chairwoman and its chief financial officer, Meng Wanzhou to Vancouver International Airport to send her off aboard her repatriation flight back to Shenzhen, Guangdong, China, after over 1000 days under house arrest.
On 3 February 2023, Cong was summoned by officials of Global Affairs Canada amidst an incident of a balloon of Chinese origin crossing into Canadian and United States airspace eventually traversing the whole contiguous United States.
He presented his credentials to Iranian foreign minister Hossein Amir-Abdollahian on May 15, four days before Abdollahian died in a helicopter crash.