Please don't. I'd rather imagine the russian accent after reading it on a flavour text than cringe repeatedly watching a train-wreck of someone failing to write an accent correctly.
Iz like ze german charakterz havingz ze bad accents, ja?
What he said. Most of us have probably not gone to Russia (or Germany for that matter) and resided within it long enough to pick up the nuances of a proper Russian accent. Also, describing motion is something good to put in your flavor text, because constantly using a 'me' to describe your character's limp gets annoying fast.
The biggest thing, is to avoid the subjective and include only the objective in your flavor text. Other than that, you can put anything you want, really.