By Parisa Hafezi, Timour Azhari and Ahmed Tolba DUBAI/CAIRO, July 29 (Reuters) - Tehran has ruled out Oman's proposal for regional joint management of the Strait of Hormuz, a senior Iranian official told Reuters on Wednesday, scuppering hopes for a resolution to the impasse that has choked off Gulf trade for months. Oman proposed a new regional deal aimed at resolving the conflict over the critical strait, through which about a fifth of global oil and liquefied natural gas flowed before the U.S. and Israel attacked Iran in February.
