Ukrainian President Volodymyr Zelenskyy¡¯s triumphant visit to Washington ended with promises of billions more in U.S. support for Ukraine, but not what he wanted most: American battle tanks, fighter jets and long-range precision missiles.

The United States has repeatedly said there are weapons it will not send to Ukraine to battle Russia¡¯s invading forces. But as the past 10 months of war have shown, the limits of U.S. support have shifted in Ukraine¡¯s favor, and Zelenskyy may yet get what he wants.

After his daring 10-hour dash to the nation¡¯s capital Wednesday, Zelenskyy left with nearly $2 billion in new arms and equipment ¡ª as well as a likely commitment from Congress for nearly $50 billion in additional aid next year.