Former Labour minister Denis MacShane has admitted false accounting by putting in fake receipts for £12,900 of "research and translation" services at the Old Bailey.
He used the money to fund trips to Europe, including to judge a literary competition in Paris.
Asked to enter a plea to the charge in a hearing at the Old Bailey, MacShane replied: "Guilty."
Mr Justice Sweeney told the former MP, that "all sentencing options remain open".
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Mladic, now 75, was the military commander of Bosnian Serb forces in the 1990s, who fought against the Bosnian Croat and Bosniak armies.
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His representatives said Cassidy, who was hospitalised last week, died "surrounded by those he loved."