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Lt. Commander
Join Date: Dec 2007
Posts: 120
# 12
06-07-2010, 09:10 PM
The story says that Cardassia is allied with the Federation. That opens the option of liasion officers or a trade. Both is canon (one 'n', the other is a weapon). Major Kira was a liasion officer and first officer to DS9 before Bajor joined the Federation. T'Pol was also both liasion and first officer, before the Federation was founded.
Riker switched places with a Klingon officer, Klingon Empire obviously not a Fed member. Phlox was part of an officer/scientist exchange program, even before the Federation existed.

So, if Cardassia is now officially allied, they can have liasions and trades. The Romulans are not allied, so they can't.