\begin{frame}
  %%LANGUAGE en \frametitle{...}
  %%LANGUAGE lt \frametitle{...}
  %%LANGUAGE ru \frametitle{...}

  %%LANGUAGE en \framesubtitle{...}
  %%LANGUAGE lt \framesubtitle{...}
  %%LANGUAGE ru \framesubtitle{...}

  %%BEGIN LANGUAGE en
  English...
  %%END LANGUAGE en

  %%BEGIN LANGUAGE lt
  Lietuviškai ...
  %%END LANGUAGE lt

  %%BEGIN LANGUAGE ru
  По-русский...
  %%END LANGUAGE ru

  \begin{itemize}
  \item
    %%BEGIN LANGUAGE en
    English...
    %%END LANGUAGE en

    %%BEGIN LANGUAGE lt
    Lietuviškai ...
    %%END LANGUAGE lt

    %%BEGIN LANGUAGE ru
    По-русский...
    %%END LANGUAGE ru
  \end{itemize}
  
\end{frame}

%------------------------------------------------------------------------------