U.S. and European officials have been discussing how to support Ukraine's government-in-exile in the event that Ukrainian President Volodymyr Zelensky has to withdraw from the capital, according to U.S. officials familiar with the situation.

Discussions ranged from supporting the relocation of Ukrainian government officials to Lviv in western Ukraine, or the possibility that they would be forced to leave Ukraine entirely and establish a government-in-exile in Poland.

However, these discussions are preliminary and have not yet involved any substantive decisions.

(CCTV reporter Gu Xiang)