At its first summits after Russia began its full-scale invasion of Ukraine, NATO gave President Volodymyr Zelenskyy pride of place at its table. It won't be the same this time. Europe’s biggest land conflict since World War II is now in its fourth year and still poses an existential threat to the continent.

Weapons deliveries approved by the Biden administration are running out and European officials concede that the Trump administration does not want to offer new aid.