During the preplanned call, Sullivan said, "they had an opportunity to talk at some length about all of the issues in the U.S. -Ukraine relationship, and President Biden was able to tell President Zelensky that he will stand up firmly for Ukraine's sovereignty, territorial integrity and its aspirations as we go forward".
In a statement, Zelensky said he accepted the invitation. In their phone call, Biden reaffirmed support for providing a pathway for Ukraine to join the North Atlantic Treaty Organization (NATO), he added.
Sullivan also said Biden told the Ukrainian president that "he looks forward to welcoming him to the White House here in Washington this summer after he returns from Europe".
Zelensky told Axios he was surprised and disappointed that Biden had not done more to prevent the development of Nord Stream 2, a natural gas pipeline that would allow Russian Federation to further isolate Ukraine. His country has been in conflict with Russian Federation since Putin annexed Ukraine's Crimean peninsula in 2014.
Sullivan on Monday said the Biden administration does not expect significant deliverables from the summit.
Putin on Friday also downplayed the prospects of his first face-to-face meeting with the USA president, saying it is unlikely to end in a breakthrough.
Biden departs Wednesday on his first overseas trip as president that prior to the talks with Putin on June 16 will have him interacting with several dozen leaders at the G-7 summit in Cornwall in the United Kingdom, as well as at North Atlantic Treaty Organisation and European Union gatherings in Brussels, Belgium. That will follow a summit of G7 rich democracies in Britain and a meeting of North Atlantic Treaty Organisation nation leaders in Brussels on June 14.
He will then travel to Brussels, Belgium to participate in the NATO Summit, and his meeting with Putin is scheduled on June 16 in Geneva, Switzerland.
The EU and Russian Federation disagree on a wide range of issues including human rights, Russia's intervention in Ukraine and Moscow's treatment of jailed Kremlin critic Alexei Navalny, and Michel said that relations between them had reached a low point. White House officials have been critical of Russia's interference in USA elections and links to cyberattacks.