0617 GMT - U.S. Treasury yields fall in European trading as Brent oil prices slip toward $100 a barrel on a tentative improvement in the geopolitical outlook. "The immediate weakness [in oil] reflects a partial unwinding of the geopolitical risk premium rather than a collapse in underlying demand," Zaye Capital Markets' Naeem Aslam says in a note. President Trump's latest comments suggesting progress with China and leaving room for diplomacy around Iran have reduced some fear of an imminent supply shock, while stronger regional crude flows are also easing pressure on physical markets, he says. The two-year Treasury yield falls 0.8 basis points to 4.735%, while the 10-year Treasury yield drops 2.9 basis points to 4.966%, according to Tradeweb.