In Britain, Treasury chief Alistair Darling said deposits of British savers with Icesave, the online arm of Landsbanki, the bank nationalized by the Icelandic government on Tuesday.

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When the property market collapsed, the shares plummeted, becoming worthless when the bank was nationalized in 2009.

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Thus, the bank enters receivership or is nationalized.

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Ablyazov is former chairman of BTA, the biggest bank in Kazakhstan, which was nationalized last year amid billions of dollars of losses and linked to possible embezzlement issues that Ablyazov has denied.

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The Spanish bank Bankia, which was effectively nationalized this month, was not mentioned by Moody's, but the government was forced to step in Thursday to deny rumors of a run on bank deposits.

CNN: Spain faces bank concerns after downgrade

American depositary receipts of Allied Irish Banks, which is expected to be effectively nationalized, were up 4.8%, while Bank of Ireland, which is trying to raise private cash to avoid an increase in the government's 36% ownership stake, was up 15.3%.

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Some had taken decisive action overnight: Belgium nationalized the Belgian assets of banking and insurance provider Fortis on Sunday, before selling a majority stake to French bank BNP Paribas, while Germany said it would guarantee all private deposits in the country.

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