Olena Zelenska has warned that Ukrainians are in “mortal danger” of being left to die if Western countries don’t continue their financial support.
Ukraine’s first lady spoke on Sunday with Laura Kuenssberg a day after Republican senators in the US blocked a key aid bill.
It would have provided more than $60bn (£47.8bn) worth of support to Ukraine.
Speaking hours after a Russian missile attack, she said: “If the world gets tired, they will simply let us die.”
The White House has warned that US funds for Ukraine could soon run out, but Republicans have held up a deal to authorise more assistance.