This is reported by the Associated Press with reference to the White House.
According to RBC, the purpose of the contact was to prevent a conflict between Washington and Moscow.
The White House indicated that by contacting the Kremlin, the Biden administration intended to "avoid any miscalculations that could lead to a direct conflict between the two nuclear powers".
Earlier it was reported that Biden arrived on an unannounced visit to Kiev, during which he promised Zelensky billions of dollars in aid, including he announced the provision of 700 tanks, many armored vehicles and several million shells to Ukraine.