The U.S President Barack Obama told his Russian counterpart yesterday that the United States is prepared to support Moscow's mediation in Libya provided it leads to a democratic transition and the departure of leader Moammar Gadhafi. Mr. Medvedev has joined western leaders in urging Mr. Gadhafi to stepdown and Russian envoys have travelled toLibya to meet with government and rebel representatives. France has given direct aid to the rebels and is taking part in NATO airstrikes against Libyan government forces.