The central bank expanded the rouble's band by one rouble to seven roubles and now the band's lower boundary stands at 31.65 roubles while the upper boundary is at 38.65 roubles versus the euro-dollar basket, comprised of 0.55 dollars and 0.45 euros, the bank said on its web site.
The rouble ended the trading session in the MICEX exchange nearly flat at 35.83 per basket but then eased to 36.02 in the interbank market, following the central bank's move.
Versus the dollar, the rouble weakened to 32.98 in the OTC market compared with 32.76 at the MICEX close.
"The rouble has already lost around 15 kopecks versus the dollar compared to today's' MICEX closing, and we think tomorrow's opening may see another 15-20 kopecks downside," analysts at ING said in a note.
On the flip side, the rouble is set to be supported by preparations for tax payments, with mineral extraction tax and excises due on Wednesday.
According to Raiffeisen estimates, both duties could drain around 250 billion roubles ($7.63 billion) from the system.
Russian shares fell victim to international sentiment, which has deteriorated in recent days as the euro zone crisis escalates.
The rouble-based MICEX index gave up 0.5 percent to 1,365.8 points and its dollar-traded peer RTS was down 0.6 percent at 1,315.7 points.
The market had a heavy sell-off on Monday, which knocked 3 percent off MICEX and 4.9 percent off RTS, amid global market gloom caused by Spanish and Greek debt problems.
"I think all rebounds in the near term will happen only thanks to closing of short positions. All indicators suggest that there is no sense in being bullish," said Pavel Koryshev, a trader at Univer Capital.
Shares in state oil company Rosneft were down 0.4 percent after Rosneft said it had entered talks to acquire BP's 50 percent holding in Anglo-Russian oil venture TNK-BP.
BP announced in June that it was looking at selling its stake, estimated by analysts to be worth around $30 billion, without disclosing the potential buyers.
Food retailer Magnit outperformed strongly, rising 8.2 percent, after it published financial results that showed net profit in the first half of the year rising by 142 percent, beating forecasts.