Washington:U.S. President Joe Biden spoke by phone with Ukrainian President Volodymyr Zelensky on Sunday, discussing Washington's support for Kiev as the latter continued to fight against Russia on the battlefield.

"They discussed Ukraine's ongoing counter-offensive, and President Biden reaffirmed unwavering U.S. support, including through continued security, economic, and humanitarian aid," the White House said in a statement.

Biden and Zelensky also discussed "recent events in Russia," it said.

Zelensky tweeted: "I spoke with 🇺🇸 President @POTUS. A positive and inspiring conversation."

He said: "We discussed the course of hostilities and the processes taking place in Russia. The world must put pressure on Russia until international order is restored."

"I thanked the @POTUSfor the unflagging support of 🇺🇦, especially for Patriots," he said.

He said: "I am grateful for the readiness of the 🇺🇸 and the American people to stand side by side with Ukraine until the full liberation of all our territories within internationally recognized borders."

(With UNI Inputs)