The last name of the president of Russia is Пу́тин. Since people can’t read that without knowing Cyrillic, we need a way to map Cyrillic to the Latin alphabet. However, neither Cyrillic nor Latin script have universal pronunciations: the phonetic value of letters change depending on the language. This leads to the romanization of a name being different depending what the source and target language is. Пу́тин is Putin for Russian-to-English, but Poutine for Russian-to-French. They’re both equally correct, and neither is a change from the other.
The last name of the president of Russia is Пу́тин. Since people can’t read that without knowing Cyrillic, we need a way to map Cyrillic to the Latin alphabet. However, neither Cyrillic nor Latin script have universal pronunciations: the phonetic value of letters change depending on the language. This leads to the romanization of a name being different depending what the source and target language is. Пу́тин is Putin for Russian-to-English, but Poutine for Russian-to-French. They’re both equally correct, and neither is a change from the other.