Asian stocks, already under pressure from growing global growth fears, tumbled on Thursday after New York markets slumped overnight because the United States opened a new trade war front by saying it will impose tariffs on $7.5 billion of goods from the European Union. The two-year yield fell to 1.4760%, close to a two-year low of 1.4280%, after a weak U.S. private sector jobs report depressed boosted expectations that the Federal Reserve will cut interest rates this month.