The Strait of Hormuz remains a key obstacle to ending the war. Since a ceasefire broke down in July, Iran has resumed a blockade of the waterway that it first imposed early in the war. WASHINGTON/TEHRAN, Aug. 4 (Xinhua) -- U.S. President Donald Trump said on Monday that talks with Iran are "going on right now," calling it Tehran's "last chance" for a deal to end the five-month war. Iran, however,