It looks like Rokon The Rokon's wheels are hollow and will float the bike, or you can fill them with water or fuel. But I think the Rokon only drives the front wheel, so thus must be something else.
I think this Russian bike is powered by an internal combustion engine as a haze of blue smoke can be seen in one spot. A two stroke perhaps that would explain the light weight. I would guess 125cc or less with very low trail gearing from the size of those sprockets.