Six years ago this week, a war began in Eastern Europe that has challenged our basic understanding of international aggression. Vladimir Putin’s attack on Ukraine has often been called a hybrid war due to Moscow’s reliance on a confusing cocktail of unmarked troops, local proxies, and blanket disinformation. The Kremlin has been careful to stop short of the conventional threshold for international aggression, but this has not diminished the global security implications of the conflict. Quite the opposite, in fact.

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