(Repeats earlier story with no changes to text) NEW DELHI, Dec 23 (Reuters) - Cairn Energy said on Wednesday it had won an international arbitration case against the Indian government over a tax dispute that had caused concern among investors over retrospective tax claims on companies. The tribunal ruled unanimously that India had breached its obligations to Cairn under the U.K.-India Bilateral Investment Treaty and awarded Cairn damages of $1.2 billion plus interest and costs, the company said in its statement. The amount is nearly equal to London-listed Cairn’s market value of $1.3 billion as of Tuesday’s close. For India, this is the second setback after losing another international arbitration case in September against Vodafone Plc over a $2 billion retrospective tax dispute.