Russia's central bank vowed to defend its floor for the rouble last Friday as the currency sank to fresh record lows and its Finance Minister outlined forecasts for a year of no growth and a hefty budget shortfall.

The rouble fell to 40.16 versus a euro-dollar basket, just two per cent away from the 41 level signalled by the central bank as the boundary of its trading band last week, as it tried to put an end to two-and-a-half months of weakening.

Russia has allowed the currency to lose over a fifth of its value since November to adjust to a dive in commodity and oil prices and the worst economic outlook in a decade. But making the fall gradual has cost it a third of its currency reserves.

Officials now say the currency is near fair value, but markets are expected to test the central bank's resolve to defend the new trading corridor, especially as it has already spent a third of Russia's reserves on rouble support.

"There is going to be one almighty fight at 41," said a dealer at a foreign bank in Moscow.

Central bank chairman Sergei Ignatyev on Thursday affirmed the regulator's commitment to the band, saying it will be defended with market interventions and interest rates.

The rouble also sank to fresh record lows of 46.40 per euro and 35.54 per dollar.

Deputy Prime Minister Igor Shuvalov said on Thursday it could weaken further to 36 per dollar in the current climate, but added that Russia's rouble policy had not changed and the adjustments which have happened were necessary corrections.

Finance Minister Alexei Kudrin said this year would likely bring zero growth, a budget deficit of 6.1 per cent and capital outflows of at least $100 billion.

"That is a fairly high deficit, even by crisis standards," Mr Kudrin told the Duma, Russia's lower house of parliament.

Though glum, his outlook was brighter than some expect - Russian newspapers had reported that the deficit would be at least seven per cent this year, while some analysts expect the economy to contract by as much as three per cent.

With such an outlook, Russia's remaining $386.5 billion of currency reserves are a key asset which will enable it to prop up the economy, plug holes in the budget and defend its currency.

"We should not spend all our reserves during the current year," Mr Shuvalov told the Duma, adding that the current crisis will likely last three years and Russia may need the cash later.

Concerns over the reserves, though, are offset by political pressure to avoid an overly sharp depreciation. Ordinary Russians are very mindful of the last major crisis in 1998, when the currency lost over two-thirds of its value in a year.

Another way to help the rouble is for the central bank to limit its liquidity offerings to the banking sector, which could potentially prompt banks to start converting dollar and euro holders back into the rouble.

On Friday, the central bank slashed the money on offer at its first daily repo auction by 100 billion roubles to 375 billion. Bids at the tender exceeded supply by over 50 per cent.

"It is quite a fast move (to the central bank boundary) and I think we will get there in coming days, not weeks," said Julia Tsepliaeva, chief economist for Russia and CIS at Merrill Lynch.

"There, at least for propriety's sake, they will have to defend it for a while... I do not see why the exchange rate should be much weaker than the suggested level. But with such heated expectations of devaluation it is more difficult."

Sign up to our free newsletters

Get the best updates straight to your inbox:
Please select at least one mailing list.

You can unsubscribe at any time by clicking the link in the footer of our emails. We use Mailchimp as our marketing platform. By subscribing, you acknowledge that your information will be transferred to Mailchimp for processing.