The White House confirmed that Biden spoke with Zelenskky for 40 minutes but provided no other details.
The United States and Europe have already hit Russia with sanctions that will impact multiple sectors of the Russia economy. Ukraine has argued that a tougher economic response is needed and has asked for additional defense assistance.
In response, the European Union agreed Friday to freeze the assets of Russian President Vladimir Putin and Foreign Minister Sergey Lavrov along with other sanctions.
His defiance came as Russian troops pushed toward the capital Kyiv, and as questions swirled on social media about whether leaders had begun fleeing.
