the site looks so clean but I don't know what it's about so I can't determine whether it fits the design or not
I actually like this. It is simple but still looks professional. The main text is fairly easy to read (minus me not knowing Russian) although you may want to make it a bit darker. The text on the far right is very small so you may want to look at making that a bit larger.
I like it as well. The minimalism can work, but what are you selling/offering? If you are offering legal services or something presumed to be technical/intellectual. It can work. If you're selling something like cars, a food or packaged product... you need pictures, you need some pizazz.
I like the layout but the sidebar text and the logo are both very small. The logo should be more bold, you want people to remember you site.
I know that after a few hours on the internet I lose my patience. At that point the only thing that grabs my attention is color. Sometimes, if the site looks too boring I leave immediately.