Centuries-old international maritime law has to be updated to outlaw damage to undersea infrastructure such as cables and pipelines, the Estonian justice minister told Reuters after cables connecting it to Finland were again damaged this week.

Nato also says it will enhance its military presence in the Baltic after a ship was suspected of sabotaging the Estlink 2 cable.

Estonia dispatched a navy ship to patrol a 105-kilometer (65-mile) subsea power link a day after Finland seized an oil tanker suspected of damaging five cables with its anchor.