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diff --git a/sphinx/texinputs/sphinxpackagecyrillic.sty b/sphinx/texinputs/sphinxpackagecyrillic.sty
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+++ b/sphinx/texinputs/sphinxpackagecyrillic.sty
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+%% CYRILLIC IN NON-CYRILLIC DOCUMENTS (pdflatex only)
+%
+% refs: https://tex.stackexchange.com/q/460271/
+\ProvidesPackage{sphinxpackagecyrillic}%
+  [2018/11/21 v2.0 support for Cyrillic in non-Cyrillic documents]
+\RequirePackage{kvoptions}
+\SetupKeyvalOptions{prefix=spx@cyropt@} % use \spx@cyropt@ prefix
+\DeclareBoolOption[false]{Xtwo}
+\DeclareBoolOption[false]{TtwoA}
+\DeclareDefaultOption{\@unknownoptionerror}
+\ProcessLocalKeyvalOptions* % ignore class options
+
+\ifspx@cyropt@Xtwo
+% original code by tex.sx user egreg (updated 2019/10/28):
+%   https://tex.stackexchange.com/a/460325/
+% 159 Cyrillic glyphs as available in X2 TeX 8bit font encoding
+% This assumes inputenc loaded with utf8 option, or LaTeX release
+% as recent as 2018/04/01 which does it automatically.
+  \@tfor\next:=%
+    {Ё}{Ђ}{Є}{Ѕ}{І}{Ј}{Љ}{Њ}{Ћ}{Ў}{Џ}{А}{Б}{В}{Г}{Д}{Е}{Ж}{З}{И}{Й}%
+    {К}{Л}{М}{Н}{О}{П}{Р}{С}{Т}{У}{Ф}{Х}{Ц}{Ч}{Ш}{Щ}{Ъ}{Ы}{Ь}{Э}{Ю}%
+    {Я}{а}{б}{в}{г}{д}{е}{ж}{з}{и}{й}{к}{л}{м}{н}{о}{п}{р}{с}{т}{у}%
+    {ф}{х}{ц}{ч}{ш}{щ}{ъ}{ы}{ь}{э}{ю}{я}{ё}{ђ}{є}{ѕ}{і}{ј}{љ}{њ}{ћ}%
+    {ў}{џ}{Ѣ}{ѣ}{Ѫ}{ѫ}{Ѵ}{ѵ}{Ґ}{ґ}{Ғ}{ғ}{Ҕ}{ҕ}{Җ}{җ}{Ҙ}{ҙ}{Қ}{қ}{Ҝ}{ҝ}%
+    {Ҟ}{ҟ}{Ҡ}{ҡ}{Ң}{ң}{Ҥ}{ҥ}{Ҧ}{ҧ}{Ҩ}{ҩ}{Ҫ}{ҫ}{Ҭ}{ҭ}{Ү}{ү}{Ұ}{ұ}{Ҳ}{ҳ}%
+    {Ҵ}{ҵ}{Ҷ}{ҷ}{Ҹ}{ҹ}{Һ}{һ}{Ҽ}{ҽ}{Ҿ}{ҿ}{Ӏ}{Ӄ}{ӄ}{Ӆ}{ӆ}{Ӈ}{ӈ}{Ӌ}{ӌ}%
+    {Ӎ}{ӎ}{Ӕ}{ӕ}{Ә}{ә}{Ӡ}{ӡ}{Ө}{ө}\do
+  {%
+    \begingroup\def\IeC{\protect\DeclareTextSymbolDefault}%
+    \protected@edef\@temp{\endgroup
+    \@ifl@t@r{\fmtversion}{2019/10/01}{\csname u8:\next\endcsname}{\next}}%
+    \@temp{X2}%
+  }%
+\else
+\ifspx@cyropt@TtwoA
+% original code by tex.sx user jfbu:
+%   https://tex.stackexchange.com/a/460305/
+% 63*2+1=127 Cyrillic glyphs as found in T2A 8bit TeX font-encoding
+  \@tfor\@tempa:=%
+    {ae}{a}{b}{chrdsc}{chvcrs}{ch}{c}{dje}{dze}{dzhe}{d}{erev}{ery}{e}%
+    {f}{ghcrs}{gup}{g}{hdsc}{hrdsn}{h}{ie}{ii}{ishrt}{i}{je}%
+    {kbeak}{kdsc}{kvcrs}{k}{lje}{l}{m}{ndsc}{ng}{nje}{n}{otld}{o}{p}{r}%
+    {schwa}{sdsc}{sftsn}{shch}{shha}{sh}{s}{tshe}{t}{ushrt}{u}{v}%
+    {ya}{yhcrs}{yi}{yo}{yu}{y}{zdsc}{zhdsc}{zh}{z}\do
+  {%
+    \expandafter\DeclareTextSymbolDefault\expandafter
+               {\csname cyr\@tempa\endcsname}{T2A}%
+    \expandafter\uppercase\expandafter{\expandafter
+                 \def\expandafter\@tempa\expandafter{\@tempa}}%
+    \expandafter\DeclareTextSymbolDefault\expandafter
+      {\csname CYR\@tempa\endcsname}{T2A}%
+  }%
+  \DeclareTextSymbolDefault{\CYRpalochka}{T2A}%
+\fi\fi
+\endinput