I know it's been a few weeks, since it was posted here but I watched the entire video and the long story is that the driver sped past the road police check-point ignoring their signalling to stop, then while being chased by the police he crashed into the oncoming car which hit two more cars, he THEN drove away at speed again, but lost control of the car and went over the embankment where he hit a residential building.
Russia had (and still has afaik) a zero tolerance for alcohol, so over there it doesn't matter if you had a beer, a shot or completely drunk. Once they start drinking they don't stop just because they'd have to drive.