EXCLUSIVE: In his last newspaper interview before standing down, Keir Starmer told The Mirror Ukraine was the 'defining cause of our time' and said the UK would remain steadfast under his successor Andy Burnham

The outgoing Labour leader is set to meet Ukrainian President Volodymyr Zelensky in Kyiv on Thursday

In one of his final acts as Prime Minister, Keir Starmer will meet with war-time leader Volodymyr Zelensky in the Ukrainian capital to discuss equipping Kyiv in its fight against…