HONG KONG —  It is an image that just a year ago would have seemed unfathomable: the Canadian and Chinese leaders standing side by side. …The tide began turning early last month… Prime Minister Carney and leader Xi Jinping met on the sidelines of the Asia-Pacific Economic Co-operation summit in South Korea – the first time leaders of the two countries had met in eight years. …That has since been followed by another ministerial visit to China. China also reinstated Canada to its approved travel list for tour groups. …But as leaders in Ottawa and Beijing signal it may be time to start doing business again, some experts warn China could be attempting to exploit Canada at a vulnerable moment. …Meanwhile, the US has increasingly ramped up its economic war on its northern neighbor. …Beijing has said it will drop the canola tariffs if Ottawa does the same for Chinese electric vehicles.