MOSCOW (AP) Ordinary Russians faced the prospect of higher prices and crimped foreign travel as Western sanctions over the invasion of Ukraine sent the ruble plummeting, leading uneasy people to line up at banks and ATMs on Monday in a country that has seen more than one currency disaster in the post-Soviet era.

The Russian currency plunged about 30% against the U.S. dollar Monday after Western nations announced moves to block some Russian banks from the SWIFT international payment system and to restrict Russias use of its massive foreign currency reserves. The exchange rate later recovered ground after swift action by Russias central bank.

But later Monday, the U.S. Treasury Department announced new sanctions that would immobilize any assets of the Russian central bank in the United States or held by Americans. The Biden administration estimated that the move could impact hundreds of billions of dollars of Russian funding.

Biden administration officials said Germany, France, the UK, Italy, Japan, European Union and others will join the U.S. in targeting the Russian central bank.

In Russia, people wary that sanctions would deal a crippling blow to the economy have been flocking to banks and ATMs for days, with reports in social media of long lines and machines running out.

Moscows department of public transport warned city residents over the weekend that they might experience problems with using Apple Pay, Google Pay and Samsung Pay to pay fares because VTB, one of the Russian banks facing sanctions, handles card payments in Moscows metro, buses and trams.

A sharp devaluation of the ruble would mean a drop in the standard of living for the average Russian, economists and analysts said. Russians are still reliant on a multitude of imported goods and the prices for those items are likely to skyrocket. Foreign travel would become more expensive as their rubles buy less currency abroad. And the deeper economic turmoil will come in the coming weeks if price shocks and supply-chain issues cause Russian factories to shut down due to lower demand.

Its going to ripple through their economy really fast, said David Feldman, a professor of economics at William & Mary in Virginia. Anything that is imported is going to see the local cost in currency surge. The only way to stop it will be heavy subsidization.

The Russian government will have to step in to support declining industries, banks and economic sectors, but without access to hard currencies like the U.S. dollar and euro, they may have to result to printing more rubles. Its a move that could quickly spiral into hyperinflation.

The ruble slide recalled previous crises. The currency lost much of its value in the early 1990s after the end of the Soviet Union, with inflation and loss of value leading the government to lop three zeros off ruble notes in 1997. Then came a further drop after a 1998 financial crisis in which many depositors lost savings and yet another plunge in 2014 due to falling oil prices and sanctions imposed after Russia seized Ukraines Crimea peninsula.

Russias central bank immediately stepped in to try to halt the slide of the ruble. It sharply raised its key interest rate in a desperate attempt to shore up the currency and prevent a run on banks. It also said the Moscow stock exchange would remain closed Monday.

The bank hiked the benchmark rate to 20% from 9.5%. That followed a Western decision Sunday to freeze Russias hard currency reserves , an unprecedented move that could have devastating consequences for the countrys financial stability.

It was unclear exactly what share of Russias estimated $640 billion hard currency pile, some of which is held outside Russia, would be paralyzed by the decision. European officials said that at least half of it will be affected.

That dramatically raised pressure on the ruble by undermining financial authorities ability to support it by using reserves to purchase rubles.

Kremlin spokesman Dmitry Peskov described the new sanctions that included a freeze on Russias hard currency reserves as heavy, but argued Monday that Russia has the necessary potential to compensate the damage.

The central bank ordered other measures to help banks cope with the crisis by infusing more cash into the financial system and easing restrictions for banking operations. At the same time, it temporarily barred non-residents from selling the government obligations to help ease the pressure on the ruble from panicky foreign investors trying to cash out of such investments.

The steps taken to support the ruble are themselves painful since raising interest rates can hold back growth by making it more expensive for companies to get credit.

The ruble sank about 30% against the U.S. dollar early Monday but steadied after the central banks move. Earlier, it traded at a record low of 105.27 per dollar, down from about 84 per dollar late Friday, before recovering to 94.43.

Sanctions announced last week had taken the Russian currency to its lowest level against the dollar in history.

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Sweet contributed from New York, and McHugh from Frankfurt, Germany. AP reporter Daria Litvinova contributed from Moscow.