Prince Charles has reportedly compared Russian president Vladimir Putin to Adolf Hitler while talking to a pensioner who had lost relatives in the Nazi Holocaust.
According to the Mirror, the extraordinary comment from the Prince can spark an international controversy.
Museum volunteer Marienne Ferguson said that while talking to him, Prince said that Putin is doing just about same as Hitler.
The comment could be seen as criticism of the West for failing to stand up to Putin over his annexation of the Crimea region of Ukraine in February.