U.S. President Joe Biden and First Lady Jill Biden greet Ukrainian President Volodymyr Zelensky at the White House, Washington DC, U.S., Dec. 21, 2022. (Photo: China News Service/Chen Mengtong) This is Zelensky's first trip outside Ukraine after Russia-Ukraine conflict.

U.S. President Joe Biden and First Lady Jill Biden greet Ukrainian President Volodymyr Zelensky at the White House, Washington DC, U.S., Dec. 21, 2022. (Photo: China News Service/Chen Mengtong)