Simmons & Simmons and Allen & Overy (A&O) have taken lead roles on ONGC Videsh’s $1bn (£622m) acquisition of stakes in oil fields in Azerbaijan from New York’s Hess Corporation.

The Simmons team was led by Hong Kong partners Tom Deegan and Vivien Yang, who advised the India-based energy company on its acquisition of a 2.72% share in the Azeri, Chirag and Guneshli (ACG) fields and a 2.36% interest in the associated Baku-Tbilisi-Ceyhan (BTC) pipeline.