And, earlier this week, a Canadian citizen in China was sentenced to death after he was convicted of drug smuggling.
Days later, China detained two Canadians on suspicion of endangering state security.
"It is true that this is a hard moment".
Freeland's office did not respond when asked whether she had been trying to defuse tensions with Beijing.
"I can very clearly state that we are not anxious in the slightest", Chinese Foreign Ministry spokeswoman Hua Chunying stated, adding that Canada's "so-called allies could be counted on 10 fingers", and their opinion does not actually represent the stance of the global community.
Canada later updated its travel advisory for China, urging Canadians to "exercise a high degree of caution due to the risk of arbitrary enforcement of local laws".
"I won't comment specifically, because I may have a role down the road, but I will say that we are a rule of law country, and it's one of our most important principles and as minister of justice and attorney general for Canada I will always act to protect the rule of law", he told CBC News.
The warning from China's foreign ministry noted the "arbitrary detention" of a Chinese national in Canada at the request of a "third-party country", urging Chinese citizens to "fully evaluate the risks" before traveling to the country.
Schellenberg was detained more than four years ago, went on trial in 2016 and was initially sentenced to 15 years in prison in November.
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He's put himself up against the world for me when everyone told him, 'You can not date a girl with a sex tape. I mean, I have an idea, and I think I'm just gonna be super honest and real with them.
"We're very pleased to have this support from the European Union which., like Canada, believes in the rule of law", she told reporters ahead of a three-day meeting of Trudeau's cabinet in Sherbrooke, Quebec. She gave no details.
On Monday, a court in the northeastern Chinese city of Dalian sentenced Schellenberg to death for drug smuggling.
Even if the court accepted all the charges, it should not have increased his sentence, given that facts the prosecution presented as new evidence had already been heard in court, Zhang told Reuters.
A former Canadian ambassador to China, Guy Saint-Jacques, believes the Chinese likely interrogated Kovrig about his time as a diplomat in China and that would break the Vienna convention on diplomatic relations. Schellenberg was arrested in China in 2014 while traveling through Asia.
"The bottom line is that the death penalty shouldn't be imposed for any crime other than intentional killing", said United Nations human rights spokesman Rupert Colville.
"The sudden retrial and apparent rush to judgment has highlighted the numerous flaws in China's judicial system, " China researcher William Nee said in a statement.
MsChunying said the Dalian Intermediate People's Court had "strictly followed the provisions of the criminal procedure law" in Schellenberg's case.
Drug smuggling is routinely punished severely in China.
Schellenberg had faced a number of charges in Canada related to drug possession and trafficking, according to court records.