The Russian spy ship Yantar has been recently spotted near UK waters north of Scotland, escalating Russian "gray zone warfare" activities.UK Defense Secretary John Healey reported that British forces, including a Royal Navy frigate and RAF aircraft, are closely monitoring the vessel, believed to be mapping the UK's underwater cables which carry over 90% of the nation's data.Healey warned Russian President Vladimir Putin that the UK is ready to defend its national security with new ammunition factories and plans to join a €150 billion EU defense loan scheme.