Whether Prince Charles was correct or appropriate in what he said, it is clear he had a defensible point.
Hitler's annexations of the Sudentenland and Austria were ostensibly to protect native Germans from provocations that were largely engineered by the Nazis themselves.
Putin's annexation of Crimea was ostensibly to protect native Russians from provocations that were largely engineered by the previous, corrupt Russophilic regime.
However, an lets be clear on this, if HRH's comments "risk triggering an international scandal", what exactly is the result of Russia's illegal invasion and occupation of Crimea and interference in Eastern Ukraine? Mild shivers?