Russia's ruble advanced against the dollar and broke with a global trend Friday.
  • Russia is mulling more extreme measures to prop up the ruble, which crashed on Monday.
  • Kremlin officials discussed reviving a requirement on companies to sell export revenue, sources told Bloomberg.
  • That comes as Russia's central bank raised its benchmark rate to 12% from 8.5% on Tuesday.

Russia is reportedly mulling more extreme measures to prop up the ruble, which crashed to less than a penny on Monday.