By Alexander Kolyandr And James Marson 

Ukraine's central bank abruptly reversed a broad ban on foreign-currency purchases Thursday, a day after imposing the measures in an attempt to halt the hryvnia's free fall.

Prime Minister Arseniy Yatsenyuk had criticized the earlier decision as bad for Ukraine's economy, which is staggering after nearly a year of fighting with Russia-backed separatists in the east of the country. Although a cease-fire signed Feb. 12 appeared to be taking hold this week, government coffers in Kiev have been drained, inflation has soared and a fight with Moscow over natural-gas payments was exacerbated.

The National Bank of Ukraine said it was canceling the three-day ban on banks purchasing foreign currency for their clients and a rule that limited purchases by banks to 0.5% of their capital.

The exchange rate fell back Thursday after having recovered slightly a day earlier. The official rate was set at 30.01 hryvnia to $1, from 28.05 Wednesday.

The country's economic woes are deepening in part because of delays on legislative measures needed to unlock financing from the International Monetary Fund.

The sharp drop in the currency, combined with punishingly high interest rates, has ratcheted up pressure on Ukraine's banks, economists say.

Deposits have been bleeding out of the system in recent months, but the central bank's restrictions on taking out cash, as well as additional limits imposed by many banks themselves and high interest rates on deposits have kept the withdrawals from spiraling out of control, industry officials say.

The central bank has been pumping money into the system to cover the outflow, since other sources of finance are essentially cut off.

"Judging by the amount of the foreign debt Ukraine and its banks need to cover until mid-March, there is no immediate risk of default, while [National Bank of Ukraine] support should help to avoid the collapse of the core of the banking system," said Dmitri Polevoy, an economist at Nomura Bank.

Local units of foreign banks account for about a third of the system in Ukraine, with their international parents likely to carry most of the burden for keeping them afloat, he said. But the rest of the banking sector could prove too much for the central bank to support, even with the expected IMF assistance, he said.

Amid the economic turmoil, the Russian natural-gas monopoly OAO Gazprom signaled it could ease up on a dispute over Kiev's gas supply to the rebel-held regions, though it still threatened to cut off gas delivery to Ukraine on the wider issue of payment.

The European Union invited the Russian and Ukrainian energy ministers to a meeting Monday in Brussels to try to resolve the situation, but was awaiting a response.

Moscow has insisted it is Ukraine's responsibility to supply gas to insurgent- controlled territories. Russian President Vladimir Putin on Wednesday accused Ukraine of halting supplies, saying the alleged action by Kiev "smells of genocide."

In a televised statement, Gazprom's spokesman Sergey Kupriyanov said: "We are ready to exclude the question of gas supplies to the (rebel-held) Donbas region from our discussion with Naftogaz," the Ukrainian national gas company.

But Mr. Kupriyanov warned that Ukraine has only paid for enough gas to last until the end of the week at the current level of supply. Gazprom began requiring prepayment of gas delivery to Ukraine last spring.

"If we don't receive new funds from Kiev, naturally, we won't be able to continue supplying gas to Ukraine," he said. "Therefore, the main question that Naftogaz has to address now is to search for money to make a new prepayment."

Earlier this week Gazprom said supplies to the EU were at "serious risk" after it said Ukraine had failed to make a payment for new shipments.

The chief executive of Nagtofaz said Thursday that he couldn't authorize paying Russia for March gas supplies because of a sharp drop in the amount of gas delivered by Gazprom since Sunday.

"There is no sense in paying for something we won't get," Andriy Kobolyev said in a telephone interview from Kiev.

He said Ukraine had the funds available to make the payment, but wouldn't say how much money had been set aside.

Write to Alexander Kolyandr at Alexander.Kolyandr@wsj.com and James Marson at james.marson@wsj.com

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