accented cyrillic characters

[barnie . de . los . angeles]

Even after studying the Unicode web site for a while I am not able to 
find a solution for this issue.

The task is to include accented cyrillic characters (vowels only) into 
russian html. (Vowels are accented or "stressmarked" in Russian for 
educational purpose.)

My html pages are always utf-8 encoded.

"Pre-accented" Russian vowels obviously do not exist as Unicode 
characters of their own.

I only need one kind of accent. Its Unicode number is probably 0301 and 
it is called "accent" or sometimes "stressmark".

The remaining question is how to "combine" this accent with a vowel, or: 
how to get that dammed stress mark 0301 on top of a character?