Kyiv on Saturday staged a major drone attack on the Russian city of Kazan, 1,000 kilometres (620 miles) from the frontier, the latest in a series of escalating aerial attacks in the nearly three-year conflict.
A drone smashed into a high-rise apartment building in the city of more than 1.3 million, damaging a skyscraper but leaving no victims, local officials said.
Though attacks so far into Russian territory are rare, Kazan and the surrounding oil-rich region of Tatarstan have previously been targeted by Ukrainian drones.
Such strikes are seen as embarrassing for Russia, almost three years into its military offensive on Ukraine.
