Russian is the most geographically widespread language of Eurasia and the most widely spoken of the Slavic languages. Russian belongs to the family of Indo-European languages and is one of three (or, according to some authorities, four) living members of the East Slavic languages, the others being Belarusian and Ukrainian (and possibly Rusyn, often considered a dialect of Ukrainian). Written examples of Old East Slavonic are attested from the 10th century onwards. Today Russian is widely used outside Russia. Over a quarter of the world's scientific literature is published in Russian. It is also applied as a means of coding and storage of universal knowledge — 60–70% of all world information is published in English and Russian languages. Russian also is a necessary accessory of world communications systems (broadcasts, air- and space communication, etc). Due to the status of the Soviet Union as a superpower, Russian had great political importance in the 20th century. Hence, the language is one of the official languages of the United Nations. Russian distinguishes between consonant phonemes with palatal secondary articulation and those without, the so-called soft and hard sounds. This distinction is found between pairs of almost all consonants and is one of the most distinguishing features of the language. Another important aspect is the reduction of unstressed vowels, which is not entirely unlike that of English. Stress in Russian is neither indicated orthographically, nor governed by phonological rules. Russian is the official language of Russia. It is also an official language of Belarus, Kazakhstan, Kyrgyzstan and the de facto official language of unrecognized Transnistria, South Ossetia and Abkhazia. Russian is one of the six official languages of the United Nations. Education in Russian is still a popular choice for both Russian as a second language (RSL) and native speakers in Russia as well as many of the former Soviet republics.

The German language is a West Germanic language and one of the world's major languages. German is closely related to and classified alongside English and Dutch. Around the world, German is spoken by ~100 million native speakers and also ~80 million non-native speakers, and Standard German is widely taught in schools and universities in Europe. Worldwide, German accounts for the most written translations into and from a language In German linguistics, only the traditional regional varieties are called dialects, not the different varieties of standard German. Standard German has originated not as a traditional dialect of a specific region, but as a written language. However, there are places where the traditional regional dialects have been replaced by standard German; this is the case in vast stretches of Northern Germany, but also in major cities in other parts of the country. Standard German differs regionally, especially between German-speaking countries, especially in vocabulary, but also in some instances of pronunciation and even grammar and orthography. This variation must not be confused with the variation of local dialects. Even though the regional varieties of standard German are only to a certain degree influenced by the local dialects, they are very distinct. German is thus considered a pluricentric language. In most regions, the speakers use a continuum of mixtures from more dialectical varieties to more standard varieties according to situation. In the German-speaking parts of Switzerland, mixtures of dialect and standard are very seldom used, and the use of standard German is largely restricted to the written language. Therefore, this situation has been called a medial diglossia. Swiss Standard German is only spoken with people who do not understand the Swiss German dialects at all. It is expected to be used in school.