Russia has launched its biggest drone attack on Kyiv since its full-scale invasion of Ukraine began last year, the city's mayor has said. Residents were woken by explosions before dawn on Saturday, and for more than six hours, the booms of Kyiv's air defences echoed through the city. There was wave after wave of attacks from the north and east. Officials said that more than 75 Iranian-made Shahed drones were fired at the capital, and 74 were shot down. With Russia's dwindling missile stocks, Shahed drones are seen as a cheap alternative. They are slower than ballistic missiles and have...