Ukraine was not involved in the reported death of Russian mercenary chief Yevgeny Prigozhin, Interfax-Ukraine news agency quoted President Volodymyr Zelensky as saying on Thursday.
"We had nothing to do with it. Everybody realises who has something to do with it," Zelensky was quoted as telling journalists.
'Special operation'
Ukraine's navy and military intelligence carried out a "special operation" overnight in which units landed on Russian-occupied Crimea, the defence ministry's Main Directorate of Intelligence (HUR) said on Thursday.
The operation, which Reuters was unable to independently confirm, would amount to a rare demonstration that Ukrainian forces are able to stage ground operations in Crimea, which Russia seized and annexed in 2014.
Brief and dark video footage posted alongside the statement showed a small motorboat moving through the water at night near a coastline. HUR said the landing point was on the western tip of Crimea, near the settlements of Olenivka and Mayak.
"Special units on watercraft landed on the shore in the area of the Olenivka and Mayak settlements," HUR said in a statement.
