Tata Sons said it will resist enforcement of the arbitration award in India as also other jurisdictions as it has been barred by Indian law and public policy for paying damages awarded for breaching a contract to buyback DoCoMo shares in their joint venture at a pre-agreed price.
"DoCoMo has taken a further step to enforce the London Court of Arbitration (LCIA) award against Tata by commencing action in the United States District Court for the Southern District of New York," Japan's largest telecom firm said in a statement.
"Until, DoCoMo receives the full amount due, it will continue to seek enforcement globally," the statement said.
Tata Sons in a statement said it has from outset emphasised its "commitment to honoring its contractual obligations to DoCoMo in accordance with the applicable law."
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"Tata Sons maintains the same position with respect to the award. However, performance of the award requires the approval of the Reserve Bank of India, which to date has been denied on the basis of pre-existing regulations that are fully in the knowledge of DoCoMo.
Tata Sons said on that basis it is "resisting enforcement in India and will resist enforcement in any other jurisdiction DoCoMo files for enforcement".
It further said it has already placed the full amount awarded to DoCoMo in the arbitration - USD 1.17 billion, in cash - with the High Court of Delhi, where DoCoMo has previously filed for enforcement of the arbitral award and the entire issue is pending adjudication.
Reserve Bank of India (RBI) rules barring pre-set buyback pricing.
DoCoMo in April 2014 decided to exit the joint venture that struggled to grow subscribers quickly. It sought Rs 58 per share or Rs 7,200 crore from Tatas.
But the Indian Group offered Rs 23.34 a share in line with RBI guidelines that states that an international firm can only exit its investment at a valuation "not exceeding that arrived at on the basis of return on equity".
The Japanese firm dragged Tatas to international arbitration where it won a USD 1.17 billion award. To honour that award, an application was made to the RBI seeking exemption from the foreign exchange act.
Meanwhile, Tata Sons today said it has filed evidence with English High Court supporting application to set aside ex-parte order obtained by NTT Docomo.
"Tata Sons has today filed evidence in support of its September 5th, 2016 application before the English High Court of Justice," Tata Sons said in a statement.
The application seeks to set aside the court's ex-parte order dated July 25, 2016 that granted NTT Docomo Inc leave to enforce the LCIA arbitral award, the statement added.
Tata Sons' evidence outlines the grounds on which it will resist enforcement of the award, including the argument that performance of the award without approval by Reserve Bank of India would be illegal under Indian law and contrary to public policy.
Tata Sons clarified that by pursuing the application before the English High Court, it is "following the path laid down by the arbitral tribunal in the award".
"The arbitral tribunal, with Docomo's encouragement, expressly left open the issue of whether performance of the award would require approval from the Reserve Bank of India. Tata sought such approval and was refused. Accordingly, Tata Sons' actions do not, in any manner, detract from its stated commitment to discharge its obligations to the fullest extent permitted under law," Tatas claimed.