Oil climbs as fading US-Iran peace hopes raise supply risks

Aug 18 : Oil prices rose on Tuesday as a deal to end the Middle East war seemed further out of sight with Iran saying it will adopt a more offensive stance and the U.S. ruling out extending a ceasefire agreement, heightening worries about energy supply.Iran will shift to a "fully offensive" military posture because efforts to negotiate a permanent end to the war with the U.S. have stalled, a senior Iranian official told Reuters on Monday, as Washington ruled out extending a temporary ceasefire agreement.Outward progress towards peace talks and a resumption of oil tanker traffic through the strategic Strait of Hormuz has ground to a halt, threatening to extend the conflict that the U.S. and Israel launched with attacks on Iran on February 28.Brent crude futures climbed 27 cents, or 0.3 per