Canadian Prime Minister Stephen Harper said Iran poses the "world's most serious threat to international peace and security," CTV news reported Thursday.
Harper said he was sure Tehran is seeking nuclear weapons.
"This is a regime that wants to acquire nuclear weapons," he said speaking to Alberta radio.
The Canadian prime minister said his country was working with its allies to impose strict sanctions on the Islamic Republic in an attempt to counter their bid for nuclear armament.
He insisted that Iran's threat to close the Strait of Hormuz, an important passage for global oil, underlined the success of Western sanctions.
"That's why the regime is lashing out from time to time," he said, according to the report.
Tensions simmered between the Islamic Republic and Canada this past week, as Tehran called in Canadian charge d'affaires in Tehran, Dennis Horak, to chastise him on Canada's treatment of its aboriginal people.
A Foreign Affairs Ministry spokesperson called the Iranian criticism absurd, saying it was "regrettable that the regime in Tehran is choosing not to address its own internal shortcomings before resorting to the ridiculous and engaging in this type of preposterous PR stunt."
Canada, meanwhile, has joined Western nations including the United States in casting sanctions on Iran, including prohibiting financial transactions with the country.