Open this photo in gallery: Flags of Canada and China are placed for the first China-Canada economic and financial strategy dialogue in Beijing, China, November 12, 2018.Jason Lee/Reuters New Chinese tariffs on Canadian agricultural and food products came into force just after midnight Thursday, 12 days after they were announced by Beijing as retaliation for a levy on Chinese electric vehicles imposed by Ottawa last year. The $3.7-billion worth of tariffs on agricultural and food products piles even more pressure on Canadian exporters already worried about an escalating trade war with the United States. In a statement this month, China’s...