The war in Ukraine intensified on Sunday, as Russian troops entered the country’s second-largest city, Kharkiv, and Vladimir Putin unleashed a wave of attacks on airfields and fuel facilities.

Kharkiv residents were urged to stay indoors by governor Oleg Sinegubov, who said “there has been a breakthrough in light equipment including in the central part of the city”. A nine-storey building was reportedly hit, with one woman killed.