Canadian Prime Minister Justin Trudeau picked a Russia critic as the country's new top diplomat to work with the incoming US Trump administration and handle potentially fraught trade challenges.<br/><br/>Trade Minister Chrystia Freeland was appointed foreign affairs minister but also retained responsibility for the Canada-US relations portfolio, including the trading relationship. <br/><br/>The change is part of a wider shuffle of Trudeau's inner circle as he tries to position Canada for a new relationship with its largest trading partner. <br/><br/>Canada's relationship with its neighbour could be tested in coming years, with US President-elect Donald Trump promising to renegotiate the 1994 North American Free Trade Agreement (NAFTA) with an objective of doing away with tariff barriers between Canada, Mexico and the United States.