Russia stepped up pressure on a key asset held by TNK-BP, BP’s Russia venture, as Lord Browne, BP chief executive, arrived in Moscow for talks and the end-game neared for a possible transfer of part of a key asset to the state.

Oleg Mitvol, the official who led the state campaign against Shell’s oil and gas venture in Sakhalin2, said Russia’s Natural Resources Ministry would not budge on threats to revoke TNK-BP’s licence to develop its vast east Siberian Kovykta gas field in three months time.