President Donald Trump has made it clear he wants to see Russia’s war in Ukraine end, but his dramatic blowup with Ukrainian leader Volodymyr Zelensky in the Oval Office on Friday has thrown new uncertainties into the war.

U.S. and Russian officials held their second meeting regarding possible negotiations to end the war in Istanbul, Turkey on Thursday. Sonata Coulter, the deputy assistant secretary of state for Russia and central Europe, led the U.S. delegation while Ministry of Foreign Affairs North Atlantic Department Director Ambassador Aleksandr Darchiyev led the Russian delegation. Ukraine was excluded from both meetings.