At least three people have been killed and a blood transfusion centre bombed in Ukraine, as Russia unleashed a wave of intense drone and missile strikes after vowing to retaliate for a Ukrainian hit on Russian tankers in the Black Sea. Moscow’s second-largest airport also briefly suspended flights Sunday morning following what the Kremlin said was a foiled Ukrainian drone attack. The Ukrainian authorities have not confirmed publicly whether they were behind either raid. The Ukrainian air force said Sunday that in total Russian forces had launched 70 Iranian-made Shahed drones, as well as cruise and hypersonic missiles from aircraft over the Caspian Sea. Russian shelling in the northern region of Kharkiv also killed three people. It comes as senior officials from some 40 countries including the United States, China and India are taking part in talks in Saudi Arabia that Kyiv and its allies hope will lead to agreement on key principles for a peaceful end to Russia’s war in Ukraine. Russia is not attending. Read More ‘Extremely dangerous’ Wagner fighters seeking to destabilise Nato, Poland warns EU imposes sanctions on dozens in Belarus over protest crackdown and support for Russia What Ukraine’s First Lady Olena Zelenska wants the world to know ‘With you until the end’: Defence secretary Ben Wallace’s dramatic pledge to Ukraine after first lady’s plea