Failed bombs

When I read today that some of the terrorist's bombs failed to explode, I immediately thought of Russia. It is kind of like the game "what's the first thing that comes to your mind when I say _____?" The first thing that comes to my mind when I hear "failed bombs" or "duds" is Russia. While I am not making any accusations with this slim evidence, it seems to me I have read alot of stories referring to failures in Russian ammunition. Just an observation.