DANDONG, China—China put on trial one of two Canadians detained for more than two years in apparent retaliation for Canada’s arrest of a senior Chinese telecom executive. Canada said its consular officials were refused permission to attend the proceedings against Michael Spavor, an entrepreneur with North Korea−related business, who is accused by China of stealing state secrets. Jim Nickel, the Canadian Embassy’s deputy chief of mission, said he was told by Spavor’s lawyer that the hearing ended at noon Friday after two hours. No verdict was announced. Nickel declined to give other details, citing rules on protecting Spavor’s privacy. In a statement posted on its website, the Intermediate People’s Court of Dandong in the northeastern province of Liaoning Province said it had held a closed−door hearing against Spavor on charges of spying and illegally sending state secrets abroad. It said Spavor and his defence lawyers were present for the proceedings …