At least 17 people were killed in the "massive attack" overnight on Ukraine's capital, as mayor Vitali Klitschko warns hot water supply has been disrupted.

The brothers have had a fractured relationship for a number of years.

Alessandro Rapinese issues the prohibition for the historic city centre after an encounter with a cyclist last month.

Gaël Mocaër and Sebastian Perez Pezzani's detention is "unjustified and disproportionate", Reporters Without Borders says.