Volodymyr Zelensky made the announcement in a video shared on the Telegram messaging service, warning residents to stay in shelters, British broadcaster BBC reported.
Meanwhile, the deputy head of the president's office, Kyrylo Tymoshenko, assessed that the situation across Ukraine was "critical" after missiles struck energy facilities, leading to emergency shutdowns, news outlets said.
Parts of the capital Kyiv were thrown into darkness, with the situation becoming "extremely difficult," according to Tymoshenko.
"Russian terrorists carried out another planned attack on energy infrastructure facilities," the Ukrainian official said, as quoted by the BBC.
Earlier, Kyiv Mayor Vitali Klitschko said one person was confirmed dead as a result of the attack on the city, Polish state news agency PAP reported.
The missiles hit residential buildings in central Kyiv, leaving at least half of the capital’s residents without electricity, according to the Ukrainska Pravda website.
Meanwhile, Russia carried out missile strikes on nine other regions of Ukraine: Khmelnytskyi, Rivne, Volyn, Lviv, Zhytomyr, Vinnytsia, Dnipropetrovsk, Poltava, and Kharkiv, Ukrainska Pravda reported.
At least six major cities were targeted, including Kharkiv in the east and Lviv in the west, The Washington Post reported on its website.
Tuesday’s strikes marked the first Russian missile attack on Ukraine since the Kremlin lost the southern city of Kherson to a Ukrainian counteroffensive on Friday, the BBC reported.
Tuesday was day 265 of the Russian invasion of Ukraine.
(pm/gs)
Source: PAP, bbc.com, pravda.com.ua, washingtonpost.com