Analysts expect 'serious monetary shock' from Russian efforts to stabilize currency by raising interest rates.

Russian currency is in freefall; next step for officials may be capital controls.

Russian currency is in freefall; next step for officials may be capital controls.

Currency continues to take a beating in wake of sanctions and plummeting global oil prices.

Currency continues to take a beating in wake of sanctions and plummeting global oil prices.

Bank of Russia is attempting to stem the ruble's fall by restricting rubles available to banks in Russian repo market.

Bank of Russia is attempting to stem the ruble's fall by restricting rubles available to banks in Russian repo market.

Deputy prime minister says Russian companies should shift from overseas stock exchanges to the Moscow Exchange as sanctions mount.