Russia fired hundreds of drones at Ukraine between late Thursday and early Friday, killing seven people and destroying a factory that produces milk products for children, authorities said. Moscow and Kyiv have intensified drone strikes on each other in recent months as US-led diplomatic efforts to end the war, now in its fifth year, remain stalled over the conflict in the Middle East. Ukrainian President Volodymyr Zelensky proposed a meeting with Vladimir Putin in an open letter to the Russian leader late Thursday, saying it was only the leaders who could resolve "key issues".