TOKYO/OTTAWA (Reuters) -Canada, chair of the Group of Seven advanced economies, is working with Japan and the European Union to maintain global stability in financial markets and the financial system, Canada's Ministry of Finance said on Wednesday, as many of the world's top finance leaders are on heightened alert for signs of deeper market upheaval following the Trump administration's tariffs blitz. In a phone conference on Wednesday, Japanese Finance Minister Katsunobu Kato and his Canadian counterpart, Francois-Philippe Champagne, shared concerns over the series of tariffs implemented by the U.S. government, the ministry said in a statement.