Ukrainian President Volodymyr Zelenskiy postponed his visit to Saudi Arabia in order to not give "legitimacy" to Tuesday's meeting between U.S. and Russian officials in Riyadh, two sources familiar with the matter told Reuters.

Senior officials from the U.S. and Russia meet in Saudi Arabia on improving ties and ending the war in Ukraine - but Ukraine isn't invited.

Three Americans and two Russians made up the two teams at the talks in Saudi Araba that have underscored an end to Western isolation of Moscow. The men described the meeting as preparing the groundwork for broader "high-level" talks and agreed to reset their countries' diplomatic relations.