A female Russian cruise ship passenger has been found not guilty of assaulting a member of a Sydney bucks party with a wine bottle.

Tatiana Baladina was charged over last year's incident aboard the P&O Pacific Explorer ship – which was forced to return to Sydney after the incident.

Body camera footage captured the wild brawl sparked by a row over a bathroom queue. It included the moment the glass bottle struck Jake Russell's head, with blood flowing everywhere.

Tatiana Baladina grabbed the wine bottle from her bag and struck a bucks party member when she feared for her partner's safety. She was found not guilty of assault. (Nine)

Tatiana Baladina, left, was today found not guilty of assault by a Sydney court. (Nine)

Three bucks party members confronted Ms Baladina's party when a person apparently jumped the line.

But today her charges were dismissed after Ms Baladina argued she was protecting her partner.

She had told police: "I thought they were killing him".

The magistrate found Ms Baladina acted reasonably given it was three men versus her partner, but warned her hitting anyone with a wine bottle is disgusting.

A photo from last year showing NSW maritime police taking a group of people into custody from the cruise ship. (Nine)

A member of the bucks part -Brody Cooper of western Sydney – was found guilty of affray and given a conditional release order.