Любопытной Варваре на базаре нос оторвали (Lyubopytnoy Varvare na bazare nos otorvali)

Meaning: Being too curious about other people's business gets you into trouble.

Literally: Nosy Varvara had her nose torn off at the market

Example: “Не лезь в чужие письма. Любопытной Варваре на базаре нос оторвали.” — Keep out of other people's letters: curiosity killed the cat.

Equivalents in English, French, Spanish, Japanese, German, and Polish

English: Curiosity killed the cat
French: La curiosité est un vilain défaut (literally: Curiosity is an ugly flaw)
Spanish: La curiosidad mató al gato (literally: Curiosity killed the cat)
Japanese: 好奇心は猫をも殺す (Kōkishin wa neko wo mo korosu) (literally: Curiosity can even kill a cat)
German: Neugier ist der Katze Tod (literally: Curiosity is the cat's death)
Polish: Ciekawość to pierwszy stopień do piekła (literally: Curiosity is the first step to hell)

Origin: Who Varvara was is unknown, and no story about her has been confirmed; the rhyme of Варваре and базаре keeps the saying alive.

Words that look familiar in another language but mean something else entirely.

Magazin (Магазин) (Magazin) Actually means 'shop' or 'store'. A magazine (periodical) is журнал (zhurnal).
Familiya (Фамилия) (Familiya) Actually means 'surname'. A family is семья (semya).
Intelligentny (Интеллигентный) (Intelligentnyy) Actually means 'cultured' and 'well-mannered'. For clever, say умный (umny).

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