" Constantly changing shape as its rulers annexed contiguous territories, Russia was an empire out of scale in comparison with any of the European countries. Moreover, with every new conquest, the character of the state changed as it incorporated another brand-new, restive, non-Russian ethnic group. This was one of the reasons Russia felt obliged to maintain huge armies whose size was unrelated to any plausible threat to its external security. "
― Henry Kissinger , Diplomacy