[OS X TeX] Russian characters contained in included .pdf do not appear in compiled document

[Manuel]

Good morning. I am numerating the pages of a sheet music collection like this:


\documentclass[article,twoside,a4paper]{memoir}

\usepackage[applemac]{inputenc}
\usepackage{pdfsync}
\usepackage{pdfpages}

\begin{document}

\includepdf[pages={1-4}]{2010.pdf}
\includepdf[pages={5-11},pagecommand={\thispagestyle{headings}}]{2010.pdf}
\includepdf[pages={12-13}]{2010.pdf}
\includepdf[pages={14-21},pagecommand={\thispagestyle{headings}}]{2010.pdf}

%…and so forth

\end{document}

One of the pages of  2010.pdf contains a title in russian characters. After typesetting, they dissapear completely. Everything else works fine. Latin, modern greek, chinese and japanese characters contained in 2010.pdf appear correctly.

Thanks in advance for any help.

Manuel