You will need a return Tajik visa, a letter from a western organisation accrediting you, and a Tajik government pass (obtainable from the Tajik ministry of foreign affairs).

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Kish, an island off the Iranian coast, is a popular destination for so-called visa runs - leaving the country you are working in, for a short time, so you can get a new visa on return.

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The compelling argument is that out of 50, 000 US graduate school and PhD graduates annually, 17, 000 return back to their homeland because no appropriate visa option exists for them to stay in the US to run a startup or take on engineering jobs.

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Her return has been delayed because Ms Stewart needs an exit visa to leave India.

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The court also heard that Tazhayakov went to Kazakhstan in December 2012 and was allowed to return to the United States on January 20, despite the apparent lapse in his visa status, the same government official said.

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Tazhayakov was allowed to return to the U.S. from Kazakhstan in January despite not having a valid student visa, a federal law enforcement official told The Associated Press.

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Mr Chestnutt is set to return to the UK in the new year - because it will take a month for a new visa to be processed.

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