A sign, probably, that they're next.
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The agreement marks a significant concession by Halliburton, which has strongly rejected criticism of its involvement in Iran since it opened an office there in February 2000 through a subsidiary based in Dubai. US law prohibits American companies from direct business dealings with Iran.
The office was opened when US vice-president Dick Cheney was Halliburton's chief executive and repeatedly urged Washington to end sanctions on Iran, saying they hurt US companies and discouraged improved relations with Iran.
