The high-stakes meeting between Trump, Zelensky and European leaders took place on August 18.
The Europeans, including British PM Sir Keir Starmer, were pleased with the meeting - which took place in a much friendlier manner compared with Zelensky's last meeting at the White House.
The key outcome is the possibility of direct meetings between Russia's leader, Vladimir Putin, and Zelensky and possibly Trump.
But a noncommittal statement from Kremlin aide Yuri Ushakov on Monday night said only that it was "worthwhile" to "explore the possibility of raising the level of representatives" from the Russian and Ukrainian delegations in negotiations.
Another major talking point is on security guarantees. Trump says security guarantees for Ukraine would be "provided" by European countries with "coordination" by the US.
