The "Two Michaels" were arrested in China in December 2018 shortly after Canada arrested Huawei Chief Financial Officer Meng Wanzhou on a US extradition request.
Dozens of supporters gather at China's Shenzhen Bao'an Airport for Huawei CFO after she reached an agreement with US prosecutors to end the bank fraud case against her.
Michael Kovrig, a former diplomat, and fellow Canadian Michael Spavor were arrested in December 2018.
The closed-door trial for a Canadian man detained in China for more than two years on espionage charges lasted less than three hours, a Canadian diplomat said, criticising the lack of transparency.
Huawei chief financial officer Meng Wanzhou, was arrested on December 1, 2018 over bank fraud charges and does not think she did anything wrong.
Meng's lawyer, Scott Fenton, accuses the United States of having "breached its duty to be forthright and candid."
The letter sent to Prime Minister Justin Trudeau comes as Canadian senators called for sanctions on Chinese officials.
Michael Kovrig and Michael Spavor were detained in what was widely seen as a retaliatory measure against Canada after Huawei executive Meng Wanzhou's December 2018 arrest in Vancouver.
The ruling, which could further deteriorate relations between Ottawa and Beijing, elicited immediate strong reaction from China's embassy in Canada.
This week's hearings dealt with the question of whether the US charges against Meng Wanzhou, the daughter of Huawei's founder, are crimes in Canada as well.
Annual World Economic Forum kicks off with US President Donald Trump criticising "prophets of doom" and teenage activist Greta Thunberg urging global financial elite to act against environmental crisis.
China's Foreign Ministry complained the US and Canada were violating Meng Wanzhou's rights and called for her release.
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