Jersey officials are meeting French fishermen, who have been protesting over their post-Brexit rights, in an attempt to resolve the dispute.
Two Royal Navy ships and two French vessels are patrolling near Jersey while about 60 French and Jersey boats are at the island's St Helier port.
French fishermen say their rights are unfairly restricted by licences issued by the island under a new system.
No 10 said the PM has been in contact with Jersey officials over the row.
HMS Severn, which has previously been used to shadow Russian navy warships off the English coast, can be seen from the port, sitting off about a mile from the French boats. HMS Tamar is nearby and both ships are maintaining a presence and not making any effort to intervene.
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