A rogue submarine was being hunted by NATO patrol planes after a periscope was spotted off the western coast of Scotland. At the height of the operation, five aircraft from four different nations were working with Royal Navy ships in the search for the mystery vessel. News of the operation, comes amid growing tensions between Western powers and Russia over its role in the Ukraine crisis. Scroll down for video A periscope was sighted in waters where British submarines would normally surface as they head into or out of the Royal Navy’s submarine base at Faslane in Scotland. The incident comes just weeks after Sweden mounted a search for a suspected Russian submarine thought to be in its territorial waters. File picture
@highlight
Five aircraft from four different nations were working with Royal Navy
@highlight
They were hunting for a suspected foreign submarine near Faslane in Scotland
@highlight
Operation comes amid growing tensions between the West and Russia
‘At this stage we do not know if the reported submarine was a Russian boat, but the @placeholder have used their submarines in the past to make the point that Russia is still here.