REFILE-UPDATE 3-Russia fiercely rebukes Belarus for detaining potash boss
August 27, 2013 at 07:40 AM EDT
MINSK/MOSCOW, Aug 26 (Reuters) - Belarus detained the head of Russia's Uralkali, the world's top potash producer, and threatened to seize its assets in the country on Monday, drawing a fierce rebuke from Moscow in an escalating dispute over the collapse of a cartel.