The bombardment, which Ukrainian officials said mostly targeted Kyiv, came just a day before President Trump was expected to talk with President Vladimir V. Putin of Russia.

But Russia's preferred deep-strike weapon — the Shahed drone — has gotten some major upgrades since the start of the year, including jet engines and Starlink satellite attachments, putting pressure on Ukraine's already strained air defense.

Trump has shifted U.S. rhetoric from supporting Ukraine toward accepting some of Moscow's narrative about the war. Kyiv and its European allies are working hard to persuade him that it is now Moscow that is holding up a truce.