Why does the RTF file at the exit from doxygen not accept Russian?

Question

Machine translation from one language to another

I work in doxygen, everything is fine with html, it perfectly perceives Russian comments, and when I try to get rtf as output, it has problems with encoding, instead of Russian words, the output is something like this:
РеалР¸Ð•Ð¾Ð²Ð°Ð½Ð½Ñ‹Ð¹ клаÑÑ Ð¿Ñ€Ñмой