France has sent a naval patrol vessel to Jersey as tensions escalated as a flotilla of around 70 boats gathered in St Helier harbour in a clash over fishing rights.
Earlier, the crews of the assembled French fishing vessels set off flares and talked over maritime radio of a blockade.
Two Royal Navy ships, HMS Tamar which is equipped with machine guns and a helicopter landing pad, and HMS Severn, were keeping a distance, tracking the protest, and watching from just over a mile.
It comes after French maritime minister Annick Girardin warned on Tuesday that the country was ready to take “retaliatory measures”, after accusing the Channel Island of dragging its feet over issuing new licences to French boats.