"The Chinese government is not following the same kinds of rules and principles that the large majority of democracies follow in regards to rules-based order, in regards to worldwide relations", Trudeau told reporters in Paris on Thursday.
"We will consistently and always stand up for Canadians, particularly these Canadians who have been arbitrarily detained", Trudeau said.
A Chinese foreign-ministry spokesperson said Kovrig and Spavor have been arrested on suspicion of gathering and stealing state secrets for "foreign forces". Spavor and Kovrig have been detained in China since last December.
"Canada strongly condemns their arbitrary arrest as we condemned their arbitrary detention on December 10", said Canada's foreign affairs department in a statement on Thursday.
China is demanding Meng's immediate release and has called on the U.S. to withdraw the extradition request and stop the "unreasonable suppression" of Chinese companies. "Due to the provisions of the Privacy Act, no further information can be disclosed".
China says two Canadian citizens who have been in detention since late previous year have been formally charged with stealing state secrets, a move that is expected to further increase tension between the two countries. Neither man has been formally charged with a crime, the paper said, without saying exactly when the arrest took place. According to the Canadian government, people can be detained for up to 13½ months after an official arrest in China before formal charges are laid. Last week, a Chinese court scheduled Schellenberg's appeal hearing to begin hours after Meng faced an extradition hearing of her own in Vancouver.
Both men have been denied access to lawyers and allowed only monthly consular visits. When asked about a timeline he says they will take the time to get it right. Kovrig also holds Hungarian citizenship.
They have been accused of harming national security, but were not formally arrested until Thursday.
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Guy Saint-Jacques, one of Canada's former ambassadors to China, said their fates are likely already sealed.
"We're dealing with some very hard people".
Kovrig is a former Canadian diplomat and expert at the International Crisis Group, and Spavor is a businessman with lengthy experience in North Korea.
"The Chinese leaders have probably come to the conclusion that the extradition process of Mrs. Meng is going to last likely a long time and therefore they have made a decision to up the ante", said Saint-Jacques.
Meng is allowed to live in her Vancouver mansion, with limited mobility.
China had earlier accused the two of conspiring together to steal Chinese state secrets.
Chinese officials have accused Michael Kovrig and Michael Spavor with stealing state secrets for a foreign organisation, a serious allegation which in its most extreme cases can result in the death penalty.
Ms Meng, 47, is the daughter of Huawei Technologies Co Ltd's billionaire founder, Ren Zhengfei. Meng is accused by the USA authorities of having misled multinational financial institutions about Huawei's control of a company called Skycom operating in Iran between 2009 and 2014.