Open this photo in gallery Prime Minister Justin Trudeau holds talks with Ukrainian President Volodymyr Zelensky at the Hotel Fairmont Royal York, during the Ukraine Reform Conference, in Toronto, on July 2, 2019. Andrew Lahodynskyj/The Canadian Press

Canada will continue “to stand with Ukraine against Russian interference and aggression,” Prime Minister Justin Trudeau told Ukraine’s President Volodymyr Zelensky on Tuesday, as an international conference on the Eastern European country’s future began in Toronto.

The two leaders shook hands in front of Canadian and Ukrainian flags and, speaking in English, Mr. Zelensky thanked Mr. Trudeau for the welcome.

Mr. Zelensky is making his North American debut at the Ukraine Reform Conference in Toronto more than a month before he is to visit the United States and Ukraine’s envoy says that’s no mistake.

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Andriy Shevchenko, Ukraine’s ambassador to Canada, says that’s an indication of just how important Mr. Zelensky sees the ties between the two countries that have grown in the past 28 years.

Mr. Zelensky, a popular actor and comedian with no previous political experience, easily won this spring’s presidential election, unseating Petro Poroshenko and sparking concern about whether someone who played the Ukrainian president in a fictional TV drama was cut out for the actual job.

But Mr. Zelensky has worked quickly, dissolving his country’s parliament and pushing forward with new elections for that assembly later this month, a timeline that was months ahead of its previous schedule.

Mr. Shevchenko says the three-day reform conference will see representatives from 30 countries participating as well as representatives from major international institutions such as the International Monetary Fund and the World Bank.

It will help Mr. Zelensky set his agenda for his term in office, which includes fending off ongoing threats from Russia, Mr. Shevchenko said.

In 2014, Russia annexed Ukraine’s Crimean Peninsula in the worst breach of Europe’s borders since the Second World War, an act Canada and its Western allies view as illegal. Russia has also fomented a pro-Kremlin insurgency in the country’s east that has left more than 13,000 dead.

In November, Russia detained 24 Ukrainian sailors and seized three ships in the Kerch Strait, which connects the Sea of Azov and the Black Sea off the Crimean coast. Last month, a United Nations maritime tribunal said Russia must free the sailors and their ships. Russia says the tribunal has no jurisdiction over it.

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“The President will ask Canada to support our fight for the sailors imprisoned by Russian after the incident in Kerch,” Mr. Shevchenko said.

Canada became the first Western country to recognize Ukraine’s independence in 1991 after the fall of the Soviet Union.

“He [Zelensky] wants to have this personal connection, this personal touch. He wants to reassure this very important connection between the countries,” Mr. Shevchenko said.

Canada has supplied Ukraine with $785-million worth of military, legal, financial, development and political assistance since 2014 when President Vladimir Putin tried to bring the country back into Russia’s sphere of influence just as Ukraine was poised to deepen its integration with the European Union.

Mr. Trudeau’s office has said he and Mr. Zelensky will discuss Ukraine’s reform efforts and its path toward integration with Europe.

Canada is also home to 1.3 million people of Ukrainian descent, which makes it one of the country’s most influential diaspora communities, which has big domestic political implications with the October federal election looming.

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The Conservative opposition said on Tuesday that the Liberal government isn’t doing enough to show its support for Ukraine. Erin O’Toole and James Bezan, the party’s critics for foreign affairs and defence, called on the government to send Canadian troops to lead an international peacekeeping mission along the Ukraine-Russia border.

They also called for increases in military and development assistance, as well as more sanctions against Russians.

Foreign Affairs Minister Chrystia Freeland’s own Ukrainian heritage has helped keep the country near the top of her agenda.

She is hosting the conference and is to give a major speech.

Ms. Freeland was one of the first Western politicians to visit Mr. Zelensky in Kyiv after he was declared the victor of the presidential race at the end of April.

Canada has offered Mr. Zelensky’s officials training in how to actually run a government because they lack experience and are running a country whose institutions are not as strong as those in the West.

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With files from Alanna Rizza in Toronto