Logic of the structure of a multilingual website

Hello everyone. Our web studio has launched a multilingual website with three languages (Ukrainian, Russian, and English). The default main language is Ukrainian. Our programmer created a separate subdirectory for each language: domain/ua/, domain/ru/, domain/en/. The main domain is redirected with a 301 redirect to the language subdirectory, so the language subdirectory serves as the homepage. We argued that for the default main language, there's no need to create language subdirectories,...

Logic of the structure of a multilingual website