Ukrainian president Volodymyr Zelensky's chief of staff has resigned following an anti corruption raid on his home. Andriy Yermak has been by Zelensky's side throughout the war with Russia - he was supposed to lead crucial negotiations with US President Donald Trump's team. Ceasefire talks seemed to pick up speed this week in a flurry of diplomacy with Ukraine's leader saying there was a "common understanding". But then Russian President Vladimir Putin doubled down on his core demands saying Russia will lay down arms only if Kyiv's troops withdraw from territory claimed by Moscow.