The thing is that practically a whole town saw it. It's like the New Mexico City mass sightings.
Now they could have all been playing a trick like 'The town who cried wolf' type thing for some attention. Maybe it's that boring in Siberia. But I really don't think everyone would suddenly decide to become ufo crackpots.
Now I think something must have flown over that town that didn't look like a regular plane. And as some pointed out earlier UFO doesn't mean alien.
Also why are people laughing at 7m/s? For an object the size of a 747 to fly that slow without making a noise is quite hardcore. (unless zepplins are making a comeback, but those would have props

) Makes you think what kind of engines powered it. Maybe someone's invented an anti-grav engine that they don't want to share with the public

.
But still the fact that so many people saw it at the same time means we shouldn't just dismiss it as some crazy drunk hillbilly on crack who woke up one morning in a field of randy horses and a sore ass.