Ellie Cook is a Newsweek security and defense reporter based in London, U.K. Her work focuses largely on the Russia-Ukraine war, the U.S. military, weapons systems and emerging technology.

Andriy Yermak, chief of staff to President Volodymyr Zelenskiy, said ongoing attacks on Ukraine showed Russia did not want to end the three-year-old war. "Drones and missiles, constant attacks on ...