U.S. Treasury yields declined slightly in European trade as investors remain cautious despite a visibly calmer pattern compared with previous days.Attention now turns to U.S. GDP at 8:30 a.m. Eastern time and PCE inflation data at 10 a.m., which are likely to drive near-term volatility in both forex markets and bond yields, XTB MENA's Milad Azar said in a note."Signs of softer growth or contained inflation would reinforce expectations of a more accommodative Federal Reserve stance later this year," the mark ...