Ukraine drawn into Russian-Georgian war?

I can't recall where I first read about this (I suspect it was one of the several American-in-Ukraine bloggers I read) but I just found this AP story recently.

In essence it says that Ukraine has threatened to bar Russian warships headed to Georgia from re-entering the port of Sevastopol until the conflict is resolved.  Sevastopol, on the other side of Crimea from us, was the headquarters of the Soviet Black Sea fleet and is currently under a tenuous lease to Russia until 2017.  Were Ukraine to do this, it would further exacerbate the tensions between the 2 nations and I hope it doesn't indicate that this conflict is going regional.