He said discussions with US President Donald Trump focussed on finding solutions for the Russian-occupied Zaporizhzhia plant, including potential US investment, but denied any talks of ownership transfer.
Mr Zelensky called on Russian President Vladimir Putin to cease his demands and said there had been continued attacks on Ukraine's energy infrastructure, despite Mr Putin's pledge to halt such strikes.
Top military officers from countries across Europe and beyond met on Thursday to flesh out plans for an international peacekeeping force for Ukraine as details of a partial ceasefire are worked out.
British prime minister Sir Keir Starmer said steps were being made in the right direction towards a ceasefire as a “coalition of the willing” led by Britain and France moved into an operational phase.