Exclusive: Ukrainian president says ‘small mistake can break a big friendship’ in wide-ranging interview with Guardian Exclusive: Ukrainian president says ‘small mistake can break a big friendship’ in wide-ranging interview with Guardian Volodymyr Zelenskyy has said the decision by some Reform UK councils to take down the Ukrainian flag was the kind of “small mistake that can break a big friendship”, as he underlined the significance of strong bilateral relations. The Ukrainian president