As fears of World War Three escalate, one woman has made sure she's already stocked up her groceries in the event of a disaster. Self-proclaimed 'Doomsday prepper' Krystal Christensen has revealed she's spent $20,000 (£15,700) over the past ten years on prepping her food and grocery storage in case disaster strikes. As Vladimir Putin approved a new nuclear doctrine as fears of a third worldwide conflict escalate, Dmitry Medvedev , who has been serving as deputy chairman of the Security Council