relevant is directly related, connected, or pertinent to a topic while topical is of current interest; contemporary. If you are talking about Covid vaccinations - this is certainly topical. but not relevant in the middle of a conversation about your favourite pizza!

Hello, Irina! As in Russian those are two different words in English, though very close in meaning. Topical - актуальный Relevant - относящийся к делу, уместный. Hope this helps.