This handout photograph taken and released by the Marine Rescue Service of Russia on Wednesday shows a large diesel spill in the Ambarnaya River outside Norilsk. Photograph: Marine Resuce Service/AFP via Getty Images

Russian president Vladimir Putin approved a state of emergency in the Arctic city of Norilsk on Wednesday after a huge leak of fuel into a river and u(...)

Companies owned by Russian billionaire Oleg Deripaska (above) have warned that US sanctions against his Russian aluminium and energy empire would have a “materially adverse impact” on future business prospects and could result in technical credit defaults. Photograph: Olga Maltseva/AFP/Getty Images

Companies owned by Russian billionaire Oleg Deripaska warned that US sanctions against his Russian aluminium and energy empire would have a “materiall(...)