A year ago, Volodymyr Zelenskiy arrived in Washington as not merely the respected leader of a courageous nation, but as a global star. His address to Congress was greeted with thunderous cheers. As he returns for a third trip on Tuesday, he is seeking to win over key legislators, and the public, after Republican senators blocked $106bn in aid, primarily for Ukraine and also Israel. They have tied the spending to US immigration measures. The administration has warned that funding could run out by the end of the year. Kyiv is also trying to shore up support from its other main ally, the EU. In talks this week, Viktor Orbán, the Hungarian prime minister, is threatening to veto €50bn of support and is blocking progress on accession.

The failure of Ukraine’s counteroffensive has hit morale at home and enthusiasm for the cause abroad. Last month the commander in........

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