Prince Charles: Vladimir Putin Is Acting Like Hitler [Report]
The newspaper said several witnesses heard the prince make the comment to Marienne Ferguson, a 78-year-old who fled the Nazis aged 13 and lost family members in the Holocaust.
"I... talked with him about my own family background and how I came to Canada," Ferguson told the Mail.
"The prince then said: 'And now Putin is doing just about the same as Hitler'.
"I must say that I agree with him and am sure a lot of people do," she added. "I was very surprised that he made the comment as I know they (the Royal Family) aren't meant to say these things but it was very heartfelt and honest."
The heir met Ferguson during a tour of the Canadian Museum of Immigration in Halifax, Nova Scotia, as part of his four-day trip to Canada with his wife Camilla.
He is due to meet with Putin at D-Day commemorations in France on June 6.
Clarence House have so far declined to comment on the reports.
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