Volodymyr Zelensky has asked Marina Abramović, the performance artist, to be an ambassador for Ukraine.Ms Abramović, a fierce critic of Vladimir Putin’s illegal invasion, said the Ukrainian president had asked for her help in rebuilding schools.The 76-year-old Serbian is holding her first solo exhibition in the UK and is the first female artist to have a major show in the Main Galleries of the Royal Academy of Arts in London.