KYIV: A Russian attack has killed four people and injured three in the Ukrainian capital of Kyiv, the city’s military administration said Saturday.“We already have four dead in Shevchenkivsky district,” said Tymur Tkachenko, head of Kyiv’s military administration, in a Telegram post, adding that three people were injured.Hours earlier, Kyiv’s mayor Vitali Klitschko warned of a “ballistic missile threat” against the capital and said the city’s air defense was activated.