Between Britain, Russia, and France, what principle was central to Eastern Question diplomacy?

Question

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The balance of power was central to Eastern Question diplomacy among Britain, Russia, and France. Each power sought to maintain a balance of power in the region, with none of them becoming too dominant or weakened. This was important to prevent any one power from gaining too much influence or territory, and to maintain stability in the region.

Between Britain, Russia, and France, What Principle Was Central to Eastern