SYDNEY :Asian shares were headed for the worst week since April on Friday after the U.S. slapped dozens of trading partners with steep tariffs, while investors anxiously await U.S. jobs data that could make or break the case for a Fed rate cut next month. European stock markets are on track for a lower open, with EUROSTOXX 50 futures down 0.5 per cent. Both Nasdaq futures and S&P 500 futures slipped 0.2 per cent after earnings from Amazon failed to meet lofty expectations, sending its shares