Russia’s central bank spent as much as $1.75 billion to prop up the ruble over the last two trading days, its biggest market intervention since President Vladimir Putin’s incursion into Ukraine in March.

Russia’s central bank spent the equivalent of $980 million to shore up the ruble on Oct. 3, the latest data on the authority’s website showed today. The bank also said it shifted the upper boundary of the currency’s trading band by 10 kopeks yesterday, a move that may have involved spending between $420 million and $769 million that day. The exchange rate weakened 0.3 percent to 44.6234 versus the basket by 5:12 p.m. in Moscow, set for a record low for the fourth time this month.

Putin is suffering the consequences for shaking up the post-Cold War order in eastern Europe as the U.S. and European Union impose sanctions on his economy and investors pull money out of the country. Demand for dollars and euros is growing among Russian companies locked out of western debt markets as they contend with $54.7 billion of debt repayments in the next three months, according to central bank data.