And most of those dollars still come from companies that sell boats, fishing equipment and other marine-related products.
FORBES: Reeling In Sponsors
Russia has provided Teheran with nuclear-related technologies, missile components and other advanced equipment.
CENTERFORSECURITYPOLICY: Russia's Oil Grab
The other 20% are mainly due to faulty equipment and unsafe, weather-related flying conditions.
BBC: How human error can cause a plane crash
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