The national currency was down 1.8 percent at 79 rubles to the dollar by 5 PM Moscow time (1400GMT), its lowest mid-trading level since December 2014.
The ruble fell to an all-time low against the euro as the Central Bank set the official exchange rate at over 85 rubles to the euro today.
Oil, the mainstay of the Russian economy, recently plummeted to under USD 30 a barrel, a 13-year low. The ruble is also under pressure from economic sanctions that the West imposed on Russia for its involvement in the Ukraine crisis.
All Russian ministries are expected to present their proposed cuts by the end of the months with a view of cutting USD 6.3 billion in government expenses, Finance Minister Anton Siluanov said.
Prime Minister Dmitry Medvedev, in televised comments on Monday, said that the government finds the price of oil "difficult to predict" and that Russia should use this moment to diversify its economy away from oil since it "has got a chance now to do it as quickly as possible.
