There is no such thing as "international terrorism".
To declare war on "international terrorism" is nonsense. Politicians who do so are either fools or cynics, and probably both.
Terrorism is a weapon. Like cannon. We would laugh at somebody who declares war on "international artillery". A cannon belongs to an army, and serves the aims of that army. The cannon of one side fire against the cannon of the other.
Terrorism is a method of operation. It is often used by oppressed peoples, including the French Resistance to the Nazis in WW II. We would laugh at anyone who declared war on “international resistance”.
Carl von Clausewitz, the Prussian military thinker, famously said that "war is the continuation of politics by other means". If he had lived with us today, he might have said: "Terrorism is a continuation of policy by other means."
Terrorism means, literally, to frighten the victims into surrendering to the will of the terrorist.
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