Duck!!

What bothers me most about this meteor, or meteorite which crashed to earth in eastern Russia causing a lot of damage and injuring some 1000 people is that no one saw it coming.  You can't help but think that had it landed in a built up area we would be looking at a disaster of some magnitude, and the thought that it would have come completely out of the blue with no possibility of preparing any sort of defence is worrying to say the least.  I thought we had people looking out for and tracking these various bits of rock?