Opinion: Biden must show that the U.S. stands ready to support Ukraine, militarily if necessary

Deterrence and escalation dominance — two core ideas in strategic theory — explain why Vladimir Putin will likely soon launch a large-scale invasion of Ukraine aimed at toppling the democratic government in Kyiv. Deterrence — convincing an adversary that he cannot achieve his objectives through military action — works through two processes: denial and punishment. The likelihood that an adversary will be denied his objectives can prevent an attack.

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