By Elwely Elwelly and Parisa HafeziDUBAI, Aug 11 (Reuters) - The United States and Yemen's Iran-aligned Houthis reported separate attacks on shipping on Tuesday as prospects for ending the five-month-old Iran war appeared to dim, with Tehran saying the Strait of Hormuz would remain closed unless Washington accepts its conditions.Oil prices gained and global shares retreated amid renewed pessimism about a quick end to the conflict. Brent crude futures climbed 1.4% to settle at $88.91 per barrel and U.S. crude rose 1.3% to $83.20.

Renewed Yemen violence and Tehran's refusal to reopen Hormuz raise war fears, as a Syrian court also sentenced Assad to death.

By Elwely Elwelly and Parisa HafeziDUBAI, Aug 11 (Reuters) - The United States and Yemen's Iran-aligned Houthis reported separate attacks on shipping on Tuesday as prospects for…