US President Donald Trump acknowledged that the meeting of Russian President Vladimir Putin and Vladimir Zelensky may not be successful.

When dancing tango, two people are necessary. You understand that I want to meet both. I might be present at this meeting, but many people thought that there would be nothing about this meeting, Tass Tass quoted him.
Also earlier Trump said he would not want to be at Putin and Zelensky's possible meeting.
Trump has announced a “very important solution” in Ukraine
As noted by Russian Foreign Minister Sergei Lavrov, about the meeting Can only be said to the condition Enlighten all the issues that require discussion at the highest level, because the head of the State said earlier.