E (Kiril)
Di bahasa Rusia modern

In the specimens of the civil script presented to Peter I in 1708, forms of ⟨э⟩ were included among forms of ⟨є⟩, but the latter was deleted by Peter. The former was used in some early 18th-century Russian texts, but some authorities of the period considered it superfluous, like Mikhail Lomonosov, on the grounds that "the letter Е, having several different pronunciations, could serve in the pronoun етотъ and the interjection ей" and that it was inappropriate to introduce letters solely for use in loanwords. However, the inclusion of ⟨Э⟩ in its modern function, in the Russian Academy's Dictionary of 1789–94, marks the point from which it can be considered as an established part of the Russian orthographical standard.
There were still some objections to the letter even as late as 1817, when M. T. Kačenovskij was questioning whether "yet another hard э" was necessary when the language already had "a soft ѣ and a hard е".
In contemporary Russian, ⟨э⟩ is used to represent [e], [ɛ] in initial position (электричество 'electricity') and postvocalic position (дуэль 'duel'). Among such words are only a few native Russian roots: эт- (это 'this is', этот/эта/это 'this (m./f./n.)', эти 'these', поэтому 'thus' etc.), эк- (экий 'what a'), эдак-/этак- (эдак/этак 'that way', эдакий/этакий 'sort of') and a few interjections like эй 'hey', э 'uh, oh', э-э-э 'uh'.
Even though Russian contains a significant number of loanwords in which [e] occurs after a hard (unpalatalised) consonant, it is still the practice to use the letter ⟨е⟩ for [e], [ɛ]: теннис, сепсис (tennis, sepsis). There are few traditional exceptions to that practice among common noun loanwords:
the original list (the first half of the 20th century) contained just three words:
мэр 'mayor', from French 'maire'
пэр 'peer (a noble)', from French 'pair'
сэр 'sir', from English or from Old French 'sieur'
two later additions (1950s-1960s):
мэтр 'master, skilled artist', from French 'maître'
пленэр, from French '(en) plein air'
new additions (1980s and later) are more numerous:
рэкет 'racket, racketeering', from English
рэп 'rap (music)', from English
фэнтези 'fantasy (literature)', from English
and several others; spelling of new words sometimes varies and dictionaries often give variants or contradict one another (like хетчбэк 'hatchback (car)' in spelling dictionary vs хетчбек/хэтчбек in explanatory dictionary).
In proper nouns, however, ⟨э⟩ may occur after consonants: Улан-Удэ 'Ulan-Ude' and Блэр 'Blair'. However, many such loanwords are spelled with ⟨е⟩: Блерио 'Blériot' (a French aviator). That is the case especially for names that entered the language centuries ago like: Берлин, 'Berlin'. The use of ⟨э⟩ is much more frequent for names from non-European languages: Мао Цзэдун 'Mao Zedong'.
The letter ⟨э⟩ is also used in Russian to render initial [œ] in foreign words: thus Eure (the river in France) is written Эр. After consonants this is transcribed as ⟨ё⟩. In the 19th century, some writers used ⟨ӭ⟩ for that sound in both positions, but that was never accepted as standard orthography. (The letter ⟨ӭ⟩ was re-invented in the 20th century for Kildin Sami.) It is also used to represent a stressed [æ] in languages such as English, which can cause a problem of conflating [æ] with English [ɛ] (for example, "Addison" and "Edison" would be spelled the same). However, in other positions, Russian also uses ⟨а⟩ for [æ] and ⟨е⟩ for [ɛ].