A defunct Russian military satellite knocked out one of Iridium's (US) 66 network communications satellites above Russia's Arctic Tuesday. The accidental collision, a first, occurred at 465 miles, a very important orbit for weather and relay communications craft.
Iridium has an in-orbit spare which will be moved into its cross-linked network to replace the one lost, which incidentally was launched by a Russian rocket.
POSTER COMMENT; Needs to be a way to bring defunct spacecraft down or "move" them further out into space to minimize an accumulation of damaging debris.