US President Joe Biden, left, shakes hands with Ukrainian President Volodymyr Zelensky at Mariinsky Palace during an unannounced visit in Kiev, Ukraine, Feb 20, 2023. (PHOTO / AP)

WASHINGTON – US 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 US support, including through continued security, economic, and humanitarian aid," the White House said in a statement.

ALSO READ: PM: Nearly 60 countries assist Ukraine's reconstruction

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