In the *Voyager* episode "Message in a Bottle", the Romulans manage to steal the top-secret ship *Prometheus*, but fortunately Starfleet retrieves it thanks to the efforts of the Doctor.

First, how did they manage to steal it?

Second, what was the aftermath of their actions? I would think stealing a ship is an act of war. It seems to me the Federation let them get away with anything and just laugh it off and forgive them. If I were Federation President the Treaty of Algeron would have been scrapped.