The SBU uncovered a Hungarian military intelligence spy network in Zakarpattia region, triggering a diplomatic crisis. By afternoon, both countries had expelled each other's diplomats, with Szijjártó claiming Ukraine employed spies at its embassy in Budapest.

A high-level EU delegation arrived in Lviv for Europe Day, approving €1.9 billion in military support including €1 billion from frozen Russian assets. Ministers greenlit the creation of a tribunal to try Russian leaders for war crimes, despite Hungary's reported obstruction of Ukraine's EU path.

Trump and European leaders reportedly agreed on proposing a 30-day ceasefire, with Reuters suggesting they prepared an "ultimatum" for Putin. Putin's Victory Day parade proceeded in Moscow, but Russia continued bombing Sumy region despite supposed celebrations.

The US Embassy warned of possible "significant air attacks" in coming days, putting Ukrainians on alert following the recent aerial bombardments that preceded Putin's "Victory Day truce."