How worried should European citizens be in countries that have come to expect unprecedented levels of security and safety? If the many warnings currently circulating are to be believed, then the answer looks grim.

Leaked documents from Germany’s defence ministry suggest that Berlin is expecting Russia to extend the war that began in Ukraine in 2022 into Europe by 2025, forcing a major conflict with Nato. There are concerns that Russia will “escalate to de-escalate”, launching an attack that will be so shocking that liberal states will accept the new world order that Vladimir Putin wants to create as his legacy.

Swedish politicians have warned their citizens to prepare for the possibility of war on their territory. Others – such as the historian Niall Ferguson – suggest that what we might be seeing is a series of global events that reveal a coordinated attempt to reshape the world order.

So, how concerned should we be about the possibility of future global chaos and disorder unlike anything most of us have experienced?

One place to begin any discussion about the prospect of war is with the theory and practice of deterrence. Simply put, states usually try to deter other states from acts of war and aggression. Many will argue that the reason “great powers” do not fight each other directly is because the costs are too high. The risks of........

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