With 41 military aircraft impacted, the Ukrainian drone attack was described by some commentators as Russia's "Pearl Harbor." The attack on Pearl Harbor in December 1941 was a surprise air raid by Japan on the U.S. during World War II. Kyiv's assault follows ground advances by Moscow troops in recent days in Ukraine's Sumy border region.

U.S. President Donald Trump's special envoy for Ukraine Keith Kellogg became the first U.S. official to react to Russia's overnight large-scale attack on Ukraine on May 25, calling for the end to hostilities.

In Kharkiv region, farther to the north, prosecutors said two women were killed in a village south of Kupiansk, which has come under heavy Russian attack for months. The mayor of