Russia has accused Ukraine's special services of murdering Darya Dugina, the daughter of an ally of Russian President Vladimir Putin.
She died in a suspected car bombing on a road outside Moscow on Saturday.
Putin calls her death a "vile, cruel crime" and says she was a "bright, talented person", in a message from the Kremlin.
But Ukraine has denied any involvement with the incident. Meanwhile, Kiev officials has banned mass events in the Ukrainian capital, while the northern city of Kharkiv plans a curfew from Tuesday evening.
It comes after Ukraine's President Zelensky warned that Russia could do "something particularly ugly" ahead of Wednesday's Independence Day celebrations.
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