I've found out that you can use more languages if you're using Windows Vista, but I'm using Windows XP, and if you know now, it isn't an option for me to change the computer language in Russian. I've asked this on a Dutch forum as well, and I got the advice to change the tiles of the route. Much work, but it would work. So I opened the tiles, and I got only strange symbols. I'm sure that it's possible to change that, but I don't know how.
PS: Someone said that the Russians and Ukrainian have very beautifull route's and trains for MSTS. I agree with him