Cyrillic em-dash is rendered inconsistently

Question

I've noticed that the same Cyrillic em-dash is rendered differently in English and Russian bibliographic entries. As you can see below, in Russian it's rendered as a single rule but in English it's rendered incorrectly using two overlapped en-dashes.

How to achieve consistency between two languages?

\documentclass{scrreprt}

\usepackage[english, russian]{babel}
\usepackage{filecontents}

\begin{filecontents}{\jobname.bib}
@BOOK{Boehm:2000,
  author = {Boehm, Barry W.},
  title = {Software cost estimation with Cocomo II},
  year = 2000,
  language = {english}
}
@BOOK{Kelton:2004,
  author = {Кельтон, В. Дэвид and Лоу, Аверилл М.},
  title = {Имитационное моделирование},
  year = 2004,
  language = {russian}
}
\end{filecontents}

\begin{document}
\nocite{*}
\bibliographystyle{gost2008s}
\bibliography{\jobname}
\end{document}

Answer 1

You get the same dash if you add a suitable definition for \cyrdash

\documentclass{scrreprt}
\usepackage[T2A]{fontenc}
\usepackage[utf8]{inputenc} % change with the actual encoding you're using
\usepackage[english, russian]{babel}
\usepackage{filecontents}

%%% since T2A is loaded we can define \cyrdash to use it
\DeclareTextCommandDefault{\cyrdash}{{\fontencoding{T2A}\selectfont---}}

\begin{filecontents}{\jobname.bib}
@BOOK{Boehm:2000,
  author = {Boehm, Barry W.},
  title = {Software cost estimation with Cocomo II},
  year = 2000,
  language = {english}
}
@BOOK{Kelton:2004,
  author = {Кельтон, В. Дэвид and Лоу, Аверилл М.},
  title = {Имитационное моделирование},
  year = 2004,
  language = {russian}
}
\end{filecontents}

\begin{document}
\nocite{*}
\bibliographystyle{gost2008s}
\bibliography{\jobname}
\end{document}