Ukraine's capital, Kyiv, has come under fresh attack by Russian drones, with officials also warning of missile strikes from Moscow, APA reports citing BBC.
Kyiv Mayor Vitaliy Klitschko said explosions could be heard in the city on Tuesday morning, and that drone wreckage had sparked a fire in Desnianskyi district, near the centre.
There were also air alerts in other cities, including Kherson and Mykolaiv.
Recent days have seen major aerial assaults by both sides.
Klitschko said drone wreckage had caused a fire in Desnianskyi district, and that emergency services were on site.
The mayor of Mykolaiv, in southern Ukraine, said air defences had brought down drones in the city, with debris causing a fire.
Ukraine's air force said on Telegram that it had downed all 35 unmanned aerial vehicles (UAV) launched by Russia on Monday night. However, following those attacks, it said there were numerous missiles being fired from Russia, towards areas including Kyiv, Cherkasy and Kirovohrad.
It told residents to listen to air raid sirens and to head towards shelters.
It came after numerous attacks by both sides in recent days, with Russia retaliating against a Ukrainian strike on the Russian border city of Belgorod on Saturday, which killed at least 25 people and injured more than 100.