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“They cheated us again and again, made decisions behind our back, presenting us with completed facts,” he said. “That’s the way it was with the expansion of NATO in the East, with the deployment of military infrastructure at our borders. They always told us the same thing: ‘Well, this doesn’t involve you.’”

Comments like those — and, more important, Russia’s actions in Crimea — mean Moscow is to blame for its sudden de facto removal from the G-8, said Ariel Cohen, a senior research fellow in Russian and Eurasian studies at the Heritage Foundation.

“This is Russia’s handiwork. Without the occupation of Crimea and without mobilization of its forces and threats against Ukraine, this would never have happened,” Mr. Cohen said. “Beyond that, the G-8 is a Western alliance of democracies. Russia’s political system is different today than the Western political systems, and Russia is also anti-Western today, as was evidenced by Mr. Putin’s latest speech.”