The Russian playbook is very short. It's just a few pages. What happened in Crimea worked. I think Moldovans should be very concerned about this scenario replicating itself there, because it has been successful in Crimea up until this point.
On the issue of ports, Odessa remains right now the only deepwater port that Ukraine has. It is in a threatened position. The eastern portion of the country also has two large ports on the Azov Sea whose ships need to transit the Kerch Strait, which currently is being blockaded by Russia. For the industrial east, their exports used to transit through Mariupol and Berdyansk in eastern Ukraine. This will put a strong economic pinch on that region at a time when the government is trying to keep everyone sewn together.
These are absolutely things to be concerned about.