The Russian craft apparently was non-maneuverable.
From the main Space.com article at the top...
The 1,234-pound (560-kg) Iridium 33 satellite involved in the collision was launched in 1997; the 1,984-pound (900-kg) Russian satellite was launched in 1993 and presumed non-operational. It did not have a maneuvering system, NASA said.
http://www.space.com/news/090211-satellite-collision.html