Many languages, including English, contain words (Russianisms) most likely borrowed from the Russian language. Not all of the words are truly fluent Russian or Slavic origin. Some of them co-exist in other Slavic languages and it is difficult to decide whether they made English from Russian or, say, from Bulgarian. Some other words are borrowed or constructed from the classical ancient languages, such as Latin or Greek. Still others are themselves borrowed from indigenous peoples that Russians have come into contact with in Russian or Soviet territory.