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As its relations with Iran continue to warm, Britain is set to reopen its embassy in Tehran. Foreign Secretary William Hague said Tuesday that the "circumstances were right" for Britain to maintain a presence in the country "as soon as practical arrangements are made."

Britain cut its diplomatic ties with Iran in 2011 after attackers swarmed its embassy and ransacked the offices. Since then, relations have improved following a regime change last year and progress in talks on Iran's nuclear program. The move also comes at a time when Sunni militants are causing havoc in Iraq and Iran is said to be "providing military assistance to its historic rival."