(Reuters) - Kyiv's mayor Vitali Klitschko said on Friday the Ukrainian capital "has entered into a defensive phase" as Russian troops brought the sounds of war to the city.

       "The city has gone into a defensive phase. Shots and explosions are ringing out in some neighbourhoods saboteurs have already entered Kyiv. The enemy wants to put the capital on its knees and destroy us," he told a news briefing.

       (Reporting by Pavel Polityuk, Writing by Gabriela Baczynska; Editing by Jon Boyle)