Balto-Slavic language tree.
The Codex Zographensis is one of the oldest manuscripts in the Old Bulgarian language, dated from the late 10th or early 11th century
Example of the Cyrillic script. Excerpt from the manuscript "Bdinski Zbornik". Written in 1360.
Ethnographic Map of Slavic and Baltic Languages
Example of the Cyrillic alphabet: excerpt from the manuscript "Bdinski Zbornik" written in Old Slavonic, 1360
Cyrillic
Cyrillic Script Monument in Antarctica
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Map of the Bulgarian dialects within Bulgaria
View of the cave monastery near the village of Krepcha, Opaka Municipality in Bulgaria. Here is found the oldest Cyrillic inscription, dated 921.
Baška tablet, 11th century, Krk, Croatia.
A page from the Gospel of Miroslav, Serbian medieval manuscript, a 12th-century Byzantine-Slavonic book, National Library of Serbia.
Extent of Bulgarian dialects according to the Bulgarian Academy of Sciences shown encompassing the Eastern South Slavic dialects. Subregions are differentiated by pronunciation of man and tooth.
A page from Азбука (Букварь) (ABC (Reader)), the first Russian language textbook, printed by Ivan Fyodorov in 1574. This page features the Cyrillic alphabet.
14th-century Novgorodian children were literate enough to send each other letters written on birch bark.
The Introduction of the Slavonic Liturgy in Great Moravia (1912), by Alphonse Mucha, The Slav Epic
Areas of Eastern South Slavic languages.
A page from the Church Slavonic Grammar of Meletius Smotrytsky (1619)
10th–11th century Codex Zographensis, canonical monument of Old Church Slavonic
"Simeon I of Bulgaria, the Morning Star of Slavonic Literature". (1923), by Alphonse Mucha, The Slav Epic
Bulgarian cursive alphabet
Letters Ge, De, I, I kratkoye, Me, Te, Tse, Be and Ve in upright (printed) and cursive (handwritten) variants. (Top is set in Georgia font, bottom in Odessa Script.)
Map and tree of Slavic languages, according to Kassian and A. Dybo
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West Slav tribes in 9th–10th centuries
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Linguistic maps of Slavic languages
Alternate variants of lowercase (cursive) Cyrillic letters: Б/б, Д/д, Г/г, И/и, П/п, Т/т, Ш/ш. 
Default Russian (Eastern) forms on the left.
Alternate Bulgarian (Western) upright forms in the middle. 
Alternate Serbian/Macedonian (Southern) italic forms on the right.
See also: 
Cyrillic cursive.svg Special Cyrillics BGDPT.svg
Map of all areas where the Russian language is the language spoken by the majority of the population.

Old Church Slavonic or Old Slavonic was the first Slavic literary language.

- Old Church Slavonic

The Cyrillic script is a writing system used for various languages across Eurasia and is used as the national script in various Slavic, Turkic, Mongolic, Uralic, Caucasian and Iranic-speaking countries in Southeastern Europe, Eastern Europe, the Caucasus, Central Asia, North Asia, and East Asia.

- Cyrillic script

Of these, 10 have at least one million speakers and official status as the national languages of the countries in which they are predominantly spoken: Russian, Belarusian and Ukrainian (of the East group), Polish, Czech and Slovak (of the West group) and Bulgarian and Macedonian (eastern dialects of the South group), and Serbo-Croatian and Slovene (western dialects of the South group).

- Slavic languages

The two languages have several characteristics that set them apart from all other Slavic languages; changes include the elimination of case declension, the development of a suffixed definite article and the lack of a verb infinitive.

- Bulgarian language

These additional letters were used for Old Church Slavonic sounds not found in Greek.

- Cyrillic script

The term Old Bulgarian (старобългарски, Altbulgarisch) is the only designation used by Bulgarian-language writers.

- Old Church Slavonic

Old Bulgarian (9th to 11th centuries, also referred to as "Old Church Slavonic") – a literary norm of the early southern dialect of the Proto-Slavic language from which Bulgarian evolved. Saints Cyril and Methodius and their disciples used this norm when translating the Bible and other liturgical literature from Greek into Slavic.

- Bulgarian language

The most obvious differences between the East, South, and West Slavic branches are in the orthography of the standard languages: West Slavic languages (and Western South Slavic languages – Croatian and Slovene) are written in the Latin script, and have had more Western European influence due to their proximity and speakers being historically Roman Catholic, whereas the East Slavic and Eastern South Slavic languages are written in Cyrillic and, with Eastern Orthodox or Uniate faith, have had more Greek influence.

- Slavic languages

Both schools originally used the Glagolitic alphabet, though the Cyrillic script developed early on at the Preslav Literary School, where it superseded Glagolitic as official in Bulgaria in 893.

- Old Church Slavonic

Old Church Slavonic

- Slavic languages

Until 1945, Bulgarian orthography did not reveal this alternation and used the original Old Slavic Cyrillic letter yat (Ѣ), which was commonly called двойно е (dvoyno e) at the time, to express the historical yat vowel or at least root vowels displaying the ya – e alternation.

- Bulgarian language

Slavic languages: Belarusian, Bulgarian, Macedonian, Russian, Rusyn, Serbo-Croatian (Standard Serbian, Bosnian, and Montenegrin), Ukrainian

- Cyrillic script
Balto-Slavic language tree.

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Russian language

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East Slavic language mainly spoken across Russia.

East Slavic language mainly spoken across Russia.

Hemisphere view
Competence of Russian in countries of the former Soviet Union (except Russia), 2004
Percentage of people in Ukraine with Russian as their native language (according to a 2001 census) (by region)
A page from Azbuka (Alphabet book), the first East Slavic printed textbook. Printed by Ivan Fyodorov in 1574 in Lviv. This page features the Cyrillic script.
Russian vowel chart by
This page from an "ABC" book printed in Moscow in 1694 shows the letter П.
The Ostromir Gospels of 1056 is the second oldest East Slavic book known, one of many medieval illuminated manuscripts preserved in the Russian National Library.

It is the most spoken Slavic language, and the most spoken native language in Europe, as well as the most geographically widespread language of Eurasia.

Russian is written using the Russian alphabet of the Cyrillic script; it distinguishes between consonant phonemes with palatal secondary articulation and those without—the so-called "soft" and "hard" sounds.

Also, Russian has notable lexical similarities with Bulgarian due to a common Church Slavonic influence on both languages, but because of later interaction in the 19th and 20th centuries, Bulgarian grammar differs markedly from Russian.

The vocabulary (mainly abstract and literary words), principles of word formations, and, to some extent, inflections and literary style of Russian have been also influenced by Church Slavonic, a developed and partly Russified form of the South Slavic Old Church Slavonic language used by the Russian Orthodox Church.