This was stated by the Head of the Office of the President of Ukraine, Andriy Yermak, in a comment to France 24.
"Ukraine is ready to take part in the next meeting, but we want to hold a constructive discussion. This means it is important to receive the russian draft they promised to provide", - he said.
As a reminder, earlier Trump's special envoy Keith Kellogg stated that next week in Istanbul there will be advisors from the US, Germany, the UK, and France.