Given the billions of dollars in oil wealth at stake, it’s not surprising that the two sides in the ongoing dispute between oil major BP plc and the Russian shareholders in the joint venture BP-TNK have assembled a lengthy cast of legal advisers.

So far on the BP side it’s regular counsel Linklaters and Russian local firm Egorov Puginsky Afanasiev & Partners. The four Russian oligarchs that own the other half of the joint venture have lined up Cravath, Swaine & Moore to handle U.S. litigation and U.K. firms S.J. Berwin and Lovells to handle matters in London and Moscow, as well as Swedish firm Vinge.