US stocks opened lower as global trade tensions increased after China pushed back against Trump's accusations.Dow Jones Industrial Average shed 200 points, Nasdaq Composite lost 0.3%, S&P 500 fell below 5,900.Oil prices rose due to a smaller-than-expected OPEC+ production increase, while the dollar weakened against major currencies.The benchmark 10-year US Treasury bond yield rose to 4.43% amid the evolving situation. (This is a developing story)