If you read the latest news update from there, it would not only be foolish, but risky to visit during this turmoil. Soldiers in full battle gear were deployed today into the area and a curfew is in effect. Having sailed right after 9/11 and having some stops canceled, this situation sounds even more ominous. I would be upset if Regent DID stop there with all this taking place.
Remember - Navigator bypassed Casablanca this past spring and Voyager was able to stop.
Imagine from a personal viewpoint - what would be the value you put on your own safety and life, and then imagine a cruise line with that same responsibility for several hundred lives.