Radiant World and Sapphire Minmetals have filed a lawsuit against Glencore Plc in Singapore claiming $2 billion in damages, according to a senior executive at the group of companies. "We have filed in the Singapore court against Glencore for $2 billion," Rakesh Sethi, chairman of Sapphire Minmetals, told Bloomberg News by phone. He said that Radiantion and ways way experiences