Why are Russian troops left behind as 'Peace Keepers' in Poti?

This story doesn't really surprise me. And only time will tell what the purpose of this activity is:

http://www.iht.com/articles/2008/08/23/europe/24georgia.php

but, why have the Russians left behind a small peace-keeping force in Poti?

I think, clearly they expect some sort of NATO trechery. They are expecting the U.S., France, and UK ships that are in the area to unload not just food and water, but troops and arms. They want to be sure they have someone on scene to observe this.

If there is one thing we've taught Russia about democracy, it's: "don't trust us."

* Basil