Explosions have been heard in Kyiv and other Ukrainian cities, a day after Russia accused Ukraine of carrying out a drone attack on the Kremlin.
Attacks were also reported in Zaporizhzhia and Odesa in the south.
The air strikes come as Ukrainian President Volodymyr Zelensky is due to speak at The Hague as part of an unexpected visit to the Netherlands.
He will also visit the International Criminal Court, which is investigating alleged Russian war crimes in Ukraine.
Russia has accused Ukraine of attempting to assassinate President Vladimir Putin, but Mr Zelensky denied that his country carried out the attack.
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