The object of the current paper is related to lexical borrowings of European languages. The aim of the article is to discuss the most significant theoretical approaches to the integration of borrowings and to show the types of their assimilation on the example of Lithuanian and Russian. The research work aims at analysing lexical borrowings from different lingua franca, to determine their etymology, to show their integration types in the Lithuanian and Russian languages, as well as to establish differences between lexical borrowings and their standardized equivalents in both languages.