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Russia has more than doubled its key interest rate after the rouble slumped by 30% amid new Western sanctions.
The Bank of Russia said it raised the rate to 20% from 9.5% to help cushion the impact of the rouble's slide.
European markets fell amid fears over financial stability, with London's FTSE 100 down more than 1% and Paris and Frankfurt about 2% lower.
The price of crude oil jumped 4.5%, and the dollar and gold rose as investors sought safer places to put their money.
The emergency rate rise by Russia's central bank was a bid to halt the rapid depreciation in the value of the rouble against the dollar, which threatens to wipe out the currency's buying power and destroy the savings of ordinary Russians.
It came as the UK, along with the US and EU, cut off Russia's banks from financial markets in the West, prohibiting dealings with the central bank, state-owned investment funds and the finance ministry.
Chancellor Rishi Sunak said the measures demonstrated the UK's "determination to apply severe economic sanctions in response to Russia's invasion of Ukraine".
At the weekend, Russia's central bank issued an appeal for calm amid fears that new financial sanctions could spark a run on its banks. It said it had the "the necessary resources and tools to maintain financial stability."
A run on Russian banks would see too many people trying to withdraw money.
Videos on social media appeared to show long queues forming at cash machines and money exchanges in Moscow, worried that their bank cards may stop working or that limits will be placed on the amount of cash they can withdraw.
Last week, Russia's central bank was forced to increase the amount of money it supplies to ATMs after demand for cash reached the highest level since March 2020.
On Monday, the central bank said it had ordered brokers to suspend the execution of all orders by foreign legal entities and individuals to sell Russian investments.
It also said it had yet to decide whether to open markets other than foreign exchange and money markets on Monday.
Will Walker-Arnott, senior investment manager at Charles Stanley, told the BBC's Today programme that "it looks like Russia is increasingly becoming an economic pariah, increasingly isolated from the global financial system".
Cutting some Russian banks from international payments system Swift is the harshest measure so far imposed to date on Moscow over the Ukraine conflict.
The assets of Russia's central bank will also be frozen, limiting the country's ability to access its overseas reserves.
Russia is heavily reliant on the Swift system for its key oil and gas exports.
The intention is to "further isolate Russia from the international financial system", a joint statement said.
On Monday, the European Central Bank (ECB) said several European subsidiaries of Sberbank Russia, which is majority owned by the Russian government, were failing or likely to fail due to reputational cost of the war in Ukraine.
Sberbank Europe AG, which had total assets of €13.64bn (£11.4bn) at the end of last year, along with its Croatian and Slovenian units, suffered a rapid deposit outflow in recent days and is likely to fail to pay its debts or other liabilities, said the ECB, which is the lenders' supervisor.
Ukraine conflict: Russia doubles interest rate after rouble slumps.
Russia has more than doubled its key interest rate after the rouble slumped by 30% amid new Western sanctions.
The Bank of Russia said it raised the rate to 20% from 9.5% to help cushion the impact of the rouble's slide.
European markets fell amid fears over financial stability, with London's FTSE 100 down more than 1% and Paris and Frankfurt about 2% lower.
The price of crude oil jumped 4.5%, and the dollar and gold rose as investors sought safer places to put their money.
The emergency rate rise by Russia's central bank was a bid to halt the rapid depreciation in the value of the rouble against the dollar, which threatens to wipe out the currency's buying power and destroy the savings of ordinary Russians.
It came as the UK, along with the US and EU, cut off Russia's banks from financial markets in the West, prohibiting dealings with the central bank, state-owned investment funds and the finance ministry.
Chancellor Rishi Sunak said the measures demonstrated the UK's "determination to apply severe economic sanctions in response to Russia's invasion of Ukraine".
At the weekend, Russia's central bank issued an appeal for calm amid fears that new financial sanctions could spark a run on its banks. It said it had the "the necessary resources and tools to maintain financial stability."
A run on Russian banks would see too many people trying to withdraw money.
Videos on social media appeared to show long queues forming at cash machines and money exchanges in Moscow, worried that their bank cards may stop working or that limits will be placed on the amount of cash they can withdraw.
Last week, Russia's central bank was forced to increase the amount of money it supplies to ATMs after demand for cash reached the highest level since March 2020.
On Monday, the central bank said it had ordered brokers to suspend the execution of all orders by foreign legal entities and individuals to sell Russian investments.
It also said it had yet to decide whether to open markets other than foreign exchange and money markets on Monday.
Will Walker-Arnott, senior investment manager at Charles Stanley, told the BBC's Today programme that "it looks like Russia is increasingly becoming an economic pariah, increasingly isolated from the global financial system".
Cutting some Russian banks from international payments system Swift is the harshest measure so far imposed to date on Moscow over the Ukraine conflict.
The assets of Russia's central bank will also be frozen, limiting the country's ability to access its overseas reserves.
Russia is heavily reliant on the Swift system for its key oil and gas exports.
The intention is to "further isolate Russia from the international financial system", a joint statement said.
On Monday, the European Central Bank (ECB) said several European subsidiaries of Sberbank Russia, which is majority owned by the Russian government, were failing or likely to fail due to reputational cost of the war in Ukraine.
Sberbank Europe AG, which had total assets of €13.64bn (£11.4bn) at the end of last year, along with its Croatian and Slovenian units, suffered a rapid deposit outflow in recent days and is likely to fail to pay its debts or other liabilities, said the ECB, which is the lenders' supervisor.
