"This shows that Russia rejects peace and that its false call for a ceasefire on May 9 has nothing to do with diplomacy," Foreign Minister Andriy Sybiha wrote on social media.
The Russian military had previously declared a one-day ceasefire from May 8 to 9. May 9 is Victory Day, when the victims of World War II are commemorated; it is a major Russian holiday usually marked with military parades in Moscow.
Ukrainian President Volodymyr Zelenskyy responded by declaring his own 24-hour ceasefire, which would begin at midnight on Wednesday.
It is the ceasefire Kyiv now accuses Russia of violating.
Shortly before Kyiv's announcement, it was reported that five civilians were killed in a Ukrainian drone strike on the Russian-occupied Crimean peninsula. The attack reportedly took place in the town of Dzhankoy in northeastern Crimea, according to Russian-appointed governor Mikhail Razvozhayev. It is unclear when the attack occurred.
