Russian aviation faced big delays due to the threat posed by Ukrainian drones, while Moscow's attacks on Ukraine killed at least one person.

A drone struck the entrance to a subway station in Kyiv, where people had taken cover. Videos showed the station platform engulfed by smoke, with dozens of people inside. The station had to be ventilated in what he called an "enhanced mode".

The strikes appear to have been the most intense since President Trump announced a new plan last week to send weapons to Ukraine.