Ukraine's security agency says it has killed Russian agents suspected of assassinating a senior officer in Kyiv.

At least one person was killed and 71 wounded in Russian drone attacks on the northeast Ukrainian city of Kharkiv, officials said on Monday, and President Volodymyr Zelenskiy called for more support from Kyiv's allies.

During the night attack, Russia struck Kharkiv at least 10 times, using eight drones and two guided bombs. Two people were injured, according to the city mayor, Ihor Terekhov, and the head of the regional military administration,