I chatted with a live agent on Celebrity and this is the answer:
The safety of our passengers is always our foremost concern. Thus, Celebrity Cruises is constantly monitoring the political climates of our ports of call and has strategic teams prepared to address a variety of situations. If we feel it is unsafe for our guests and crew members to visit a particular destination, that port of call will be canceled, and we will do our best to replace it with a suitable alternative.
Currently, we still do not have cancellation updates for this sailing. Should your sailing schedule later be altered, you will be provided with an alert via your travel agency or personal email address. Rest assured that fair cancellation and alternative options will be provided to impacted guests.