A bipartisan pair of US senators met with Ukrainian President Volodymyr Zelensky in Kyiv on Friday and urged stronger sanctions against Russia, while uncertainty swirls over whether the next round of peace talks will move ahead in the coming days.

A Russian drone and missile attack on Ukraine on Saturday killed at least two people, including a 9-year-old-girl, according to officials.

Kyiv said it was committed to the search for peace, but that it was waiting for a memorandum from the Russian side setting out their proposals.