The Ukrainian capital Kyiv has been targeted by further Russian air attacks, described by one official as "exceptional in density".
Ukraine said all 18 missiles were shot down and footage showed air defences destroying targets over the city.
But Russia said its attack - which used drones and missiles - had hit all its targets.
Moscow has stepped up its air campaign in recent weeks, ahead of an expected Ukrainian offensive.
The air raid alert sounded at around 02:30 local time (23:30 GMT Monday) and was lifted two hours later in the eighth attack to hit the capital this month.
An unusually high number of loud explosions was heard in the city centre, as authorities told residents in online messages that air defence had been activated.
The head of Ukraine's armed forces, Valerii Zaluzhny, said Russia attacked Kyiv from the north, south and east and that 18 air, sea and land-based missiles had been used.
Serhiy Popko, head of the Ukrainian capital's military administration, described the barrage as being the "maximum number of attack missiles in the shortest period of time".
"According to preliminary information, the vast majority of enemy targets in the airspace of Kyiv were detected and destroyed," he added.