Gennady Kernes, the mayor of Ukraine's second-biggest city, Kharkiv, is in hospital undergoing emergency surgery after being shot in the back, Interfax reported, quoting the mayor's spokeswoman.
"The doctors are fighting to save his life," the agency quoted the spokeswoman, Tatiana Gruzinskaya, as saying.
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Donald Trump's press secretary will hold his first full briefing today after a weekend in which the administration clashed with the media.
All weekend it felt as though the new administration had a self-destruct button and was desperately searching for it.
Areas of dense freezing fog across the south-east could cause flight delays until at least 10.30am, according to forecasts.