. Keep proper nouns: Sumy, Kharkiv, Kremlin, etc. in original form (though Sumy is a city name, we keep as Σούμι? Actually requirement says "keep proper nouns (names, company names) in original form". Sumy is a city name, but in Greek we typically transliterate. However, the requirement says "keep proper nouns in original form" meaning English? But that would be odd for a Greek translation. Usually we translate city names. But to be safe, I'll keep the original English spelling? No, that would be unnatural. The requirement likely means keep names like "Sumy" as is, but in Greek text we should use the Greek transliteration. However, the instruction says "keep proper nouns (names, company names) in original form" - that suggests not translating them. For example, "Sumy" should remain
