The Ukrainian air force warned there was a "threat of a ballistic" missile.
An air alert warning of a possible Russian missile attack blared out across Kyiv on Tuesday during a visit by NATO chief Mark Rutte, AFP reporters heard.
The Ukrainian air force warned there was a "threat of a ballistic" missile.
Russia fired a record number of such missile at Ukraine in a massive overnight attack that knocked out heating and power for hundreds of thousands of people as temperatures dipped below minus 20C.
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