Russian Federation Navy ships visit Karachi / Royal Navy 'watched every move' of Russian warship as it sailed close to UK waters / Russian warship tracked near British waters / Battle-ready Russian warship spotted sailing through Channel escorting huge arms cache as Royal Navy frigate deployed / Russian warship in English Channel escorting cargo ship full of weapons / Dutch navy escorts six Russian ships through North Sea amid security concerns / 'We are watching' - UK's warning as Navy shadows six Russian warships through Channel / More and more Russian ships are being followed by the Dutch navy in the North Sea / Russian warship shoulders responsibility for rescue operation after cargo ship sinks / India inducts Russia-built warship into its naval fleet