[AdmSmith]

According to a news report I once read, he is a guy who could speak every German dialect.

He has a Russian accent when he speaks German. Listen here https://www.quora.com/How-good-is-Russian-president-Vladimir-Putins-German
I do not think that he can speak any dialect.

[TigerLikesRooster]

Command of a foreign language deteriorates after return to one’s home country. It is especially true for pronunciation if there are no longer opportunities to speak the language daily.