"We are calling for peace, for order, for dialogue. we certainly call on China to be very careful and very respectful in how it deals with people who have legitimate concerns in Hong Kong", Trudeau told a televised news conference in Toronto.
Police said they had not received a formal application for the airport protest and warned against violence or disruptions that could endanger public safety.
Operations have resumed at Hong Kong airport, authorities have said, after protesters shut down one of the world's busiest airports in a dramatic escalation of months of mass demonstrations.
The increasingly violent protests have plunged Chinese-ruled Hong Kong into its most serious crisis in decades and presented a serious challenge to Beijing.
The Chinese government has released footage that appears to show military vehicles driving towards the Hong Kong border. "The recovery may take a long time", she said.
But the chaos was far from over, with a massive backlog of flights to clear.
Around 50 protesters remained camped in the terminals on Tuesday morning, while more than 100 passengers were spotted queuing at Cathay's ticket counter, Reuters news agency reported. She's the first woman to lead Hong Kong but many view her as Beijing's puppet.
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Only a handful of protesters remained at the airport and it was unclear how many would respond to calls on social media to return later in the day.
Shares in Cathay Pacific (0293.HK) tanked in Monday trading after the airline bowed to pressure from China to fire staff that protested against a bill that allows authorities in Hong Kong to extradite locals to mainland China.
Legislators and journalists were invited to witness the display of extreme crowd control tactics, which came after a weekend of protests at the airport and on the streets of one of the city's main shopping districts. One video shows individuals who are believed to be police officers pushing protesters down a moving escalator, while other reports suggest that police fired tear gas inside an enclosed Hong Kong subway station.
Addressing reporters Monday, Yang Guang, China's top policy official for Hong Kong and Macau, condemned protesters who he said attacked police stations with petrol bombs, injuring several officers.
"Hong Kong's radical demonstrators have repeatedly used extremely risky tools to attack police officers, which already constitutes a serious violent crime, and also shows the first signs of terrorism emerging", said Yang Guang, spokesman for the Hong Kong and Macao Affairs Office of the State Council.
"As violence increases, the more middle class people and ordinary people of Hong Kong will turn against this movement".
Critics contend that defendants extradited to mainland China may not have access to a fair trial in the judicial system there and that Beijing could also use the law to crack down on Hong Kong dissidents.
A senior official in the administration of US President Donald Trump on Monday urged "all sides" to avoid violence in Hong Kong.