Trump envoy calls Zelensky a 'courageous leader' after days of criticism from White House
Keith Kellogg says he had "positive discussions" with the Ukrainian leader, after the White House says Trump is "frustrated".
Twelve killed in strikes on Ukraine as White House urges Zelensky to reach minerals deal
Donald Trump's Ukraine envoy Keith Kellogg says he has held "extensive and positive" discussions with Volodymyr Zelensky.