LONDON — Over the past week, in response to the gut-wrenching scenes in Ukraine, Western unity has been impressive and heartening. I know from my near-daily conversations with President Volodymyr Zelensky that this has provided Ukrainians with some comfort in their hour of need.

Never in my life have I seen an international crisis where the dividing line between right and wrong has been so stark, as the Russian war machine unleashes its fury on a proud democracy. Russia’s reckless attack on the Zaporizhzhia nuclear power plant reminds us just how grave the stakes are for everyone. More than one million people have fled the violence, toward an uncertain future.

President Biden has displayed great leadership, consulting and convening allies, exposing the lie that America’s commitment to Europe is somehow diminished. The European Union has undertaken a remarkable effort to align behind severe sanctions on Russia. Dozens of European countries are sending defensive equipment to Ukraine’s armed forces. But have we done enough for Ukraine? The honest answer is no.

Vladimir Putin’s act of aggression must fail and be seen to fail. We must not allow anyone in the Kremlin to get away with misrepresenting our intentions in order to find ex post facto justification for this war of choice. This is not a NATO conflict, and it will not become one. No ally has sent combat troops to Ukraine. We have no hostility toward the Russian people, and we have no desire to impugn a great nation and a world power. We despair of the decision to send young, innocent Russians into a futile war.

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