Canada, worried about possible casualties, is taking months longer than expected to decide whether to send troops to a United Nations mission in Mali, worrying allies and potentially undermining Prime Minister Justin Trudeau’s commitment to peacekeeping. Trudeau replaced a Conservative government in November 2015 that had little time for the United Nations. Trudeau’s Liberals declared “Canada is back” in August 2016 and said they would commit up to 600 soldiers for possible UN deployment. Officials said one option was Mali, where the United Nations has a 10,000-strong force to help deal with Islamist militants. “This would be a combat mission. Casualties are inevitable,” said one person familiar with the matter.