Biden to hold weekend call with Ukraine leader after Putin talks

US President Joe Biden speaks on the phone to his Russian counterpart Vladimir Putin on December 30, 2021 -- Biden will speak to his Ukrainian counterpart on January 2, 2022

President Joe Biden and his Ukrainian counterpart Volodymyr Zelensky will speak by phone on Sunday, both sides confirmed, after the US leader again warned that Russia's Vladimir Putin would face a tough response to any invasion of the eastern European country.

- US warns of tough sanctions - In a readout after Thursday's call, the Kremlin stressed that Biden told Putin that US offensive weapons would not be deployed in Ukraine.