By Ghaida Ghantous and Aziz El Yaakoubi DUBAI (Reuters) – The United Arab Emirates is walking a diplomatic high wire between superpower ally Washington, new friend Israel and old adversary Iran as it seeks to avoid a costly regional conflict that could torpedo its trade and tourism ambitions. Abu Dhabi hosts Israel’s prime minister this week and will receive a U.S. delegation seeking to warn companies in the UAE about compliance with sanctions on Iran over its nuclear activities. The Gulf state also dispatched a senior official to Tehran last week in a bid to mend ties and contain tensions. Th…

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