OTTAWA — Prime Minister Justin Trudeau said that his government will offer payments to relatives of the dozens of Canadian citizens and permanent residents killed when a Ukrainian airliner was downed by missiles launched by Iranian forces.

At a news conference on Friday, Mr. Trudeau said the payments are an interim measure and that Canada will not abandon its efforts to make Iran provide substantial compensation to the families of the victims.

He said that Iran bears full responsibility for the incident.

“I want to be clear: we expect Iran to compensate these families,” Mr. Trudeau said. “But I have met them, they can’t wait weeks. They need support now.”

Canada will provide each of the families with 25,000 Canadian dollars, about $19,000, to cover the cost of funerals and travel. The prime minister said that 57 of the victims were Canadian citizens and another 29 were permanent residents of the country.