There are a lot of borrowings (заимствования) in all languages because of mixing of cultures and languages. Think of English words which are used by the Russians and Russian

English words in Russian: president, progress, parliament, optimistic, football, doctor...
(Английские слова в русском: президент, прогресс, парламент, оптимистичный, футбол, доктор)

Russian words in English: sputnik, tsar, samovar, matreshka, balalaika...
(Русские слова в английском: спутник, царь, самовар, матрешка, балалайка)