More than a dozen Russian missiles pounded energy facilities and other infrastructure across Ukraine on Saturday, the Ukrainian air force said, with strikes causing blackouts in parts of different regions.

President Volodymyr Zelenskyy said the Russian attacks had struck on a "very wide" scale. He pledged that his military would improve on an already good record of downing missiles with help from its partners.

At the same time, Russian occupation authorities in the southern Ukrainian city of Kherson urged civilians to leave immediately, citing what they called a tense military situation.