From his Foreign Affairs essay:

"We need a new Western approach to this revanchist Russia. We should start by ensuring that the G-8, the group of eight highly industrialized states, becomes again a club of leading market democracies: it should include Brazil and India but exclude Russia. Rather than tolerate Russia's nuclear blackmail or cyberattacks, Western nations should make clear that the solidarity of NATO, from the Baltic to the Black Sea, is indivisible and that the organization's doors remain open to all democracies committed to the defense of freedom. …More broadly, America needs to revive the democratic solidarity that united the West during the Cold War."

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