Russian President Vladimir Putin says Prince Charles's reported comparison of him to Adolf Hilter was unacceptable, wrong and beneath the Royal Family.
A Canadian museum volunteer told The Daily Mail that Prince Charles made the remark to her in a private conversation during his visit to Canada.
Putin says making such a comment is "not what monarchs do" when he sat down for a question-and-answer session Saturday with international news agencies, including The Canadian Press.
Marianne Ferguson, 78, told the British tabloid that she told the prince about how her Jewish family fled the Nazi occupation of Danzig at the outset of the Second World War, and that he then drew a parallel with Russia's annexation of the Crimean peninsula in March.
He reportedly told Ferguson that Putin was behaving like Hitler. A spokeswoman for the Prince of Wales has declined to comment on the allegation.
Putin says he will not be guided by what people say about him. His only compass is the interests of the Russian people, he said.