A Russian spy ship has been escorted out of the Irish Sea after it entered Irish-controlled waters and patrolled an area containing critical energy and internet submarine pipelines and cables.

It was spotted on Thursday east of Dublin and south-west of the Isle of Man but Norwegian, US, French and British navy and air defence services initially observed it accompanying a Russian warship, the Admiral Golovko, through the English channel last weekend.

The Irish navy ship the LÉ James Joyce escorted it out of the Irish exclusive economic zone (EEZ) at about 3am on Friday with the air corps continuing to monitor its movements as it headed south.

Its presence has raised fresh concerns about the security of the interconnector cables that run between Ireland and the UK carrying global internet traffic from huge datacentres operated by tech companies including Google and Microsoft, which have their EU headquarters sited in Ireland.