Brussels: The European Union slapped revenge tariffs on iconic US products including bourbon, jeans and motorcycles on Friday in its opening salvo in a trade war with President Donald Trump.The tariffs, which took effect at midnight according to the EU´s official journal, will further fuel jitters on world stock markets that are already alarmed by trade tensions between the United States and China.Customs agents across Europe´s colossal market of 500 million people will now impose the duty,...