According to Jin10, on May 28, Ukraine and Russia exchanged major strikes across multiple fronts. Five Ukrainian regions experienced blackouts following a new Russian offensive, while Ukrainian drone strikes ignited fires at Russian Black Sea ports. Russian forces claimed to have captured Vozdiyzivka in the Zaporizhzhia region and Hraniiv in the Kharkiv region. A missile was reportedly downed over Taganrog in southern Russia.
On the diplomatic front, Ukrainian President Volodymyr Zelensky sent a letter to U.S. President Trump highlighting Ukraine's critical air defense material shortage. EU Commission President Ursula von der Leyen reaffirmed Europe's full support for Ukraine in a phone call with Zelensky. Russian and Iranian diplomats encountered obstacles while traveling to the United Nations.