The impact of sanctions against Russia today sent the rouble to its lowest ever level and prompted the country's central bank to lift interest rates to 20%.
Oil prices also rose to as high as $105 a barrel and the FTSE 100 index opened sharply lower ahead of big falls for Wall Street markets later today.
BP shares have fallen 4% after the oil giant announced that it would offload the 19.75% stake it has held in Russia's Rosneft since 2013.