The difficulties encountered by the Allies in taking combined action in Russia show that to this fundamental instability due to the moral nature of Nationalism, must be added, as causes of military paralysis, the economic disruption which reduces the available material resources, and the social unrest (largely the result of the economic difficulties) which undermines the cohesion even of the national unit.
— from The Fruits of Victory A Sequel to The Great Illusion by Norman Angell