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 says ‘hopefully it will be a productive day, a ceasefire will take place, and this very violent war ... will end'