Kiev has been calling on its allies to send modern fighter jets described by Ukrainian President Zelensky as "wings for freedom" The wish list includes the U.S.-made F-16 because of its destructive power and global availability, as Sweden's Greben fighter jets want. China's special envoy to Ukraine Li Hui on Thursday concluded a two-day visit in Kiev to discuss a "solution" to the conflict.

The United Nations Security Council will meet Friday to discuss the situation in Ukraine.