 BP has struck what it describes as an  historic  agreement with the Russian government, in a  ?10 billion deal to exploit potentially huge deposits of oil and gas in the arctic.  The UK energy giant, recovering from its Gulf of Mexico oil spill disaster, will swap 5% of its shares, valued at $7.8bn, for 9.5% of Russia s state-controlled Rosneft in an agreement that immediately raised concerns about US economic security from at least two american lawmakers and criticism from environmentalists.  The deal covers huge areas of the South Ka 