Why Amazon is feuding with a partner and billionaire Mukesh Ambani

A legal spat between Amazon.com Inc. and its Indian partner that started with an arbitration verdict in Singapore has got fiercer in New Delhi courtrooms. And neither side is ready to back off.
The U.S. e-commerce giant and Mumbai-based Future Group, whose retail assets billionaire Mukesh Ambani’s Reliance Industries Ltd. agreed to buy for $3.4 billion in August, are locked in a dispute over that deal. Amazon says Future violated a partnership contract with the asset sale to its rival and wants to scuttle it, while the indebted Indian group says it would collapse if the transaction fails.