Russian forces targeted the eastern Ukrainian city of Dnipro overnight with 16 missiles and 20 attack drones, Ukraine's army said Monday.
The attacks on troops and infrastructure were carried out by various types of missiles and Iranian-made Shahed drones, the general staff wrote on Facebook, saying its air defences had destroyed all the drones and four of the cruise missiles, without giving details.
Dnipro is a large city with almost one million inhabitants before the war. It is around 125 kilometres (78 miles) from the current front line.
Officials said the scale of the attack was unprecedented.
"Today the whole of Dnipro did not sleep. There has not been such shelling since the start of the war," the city's mayor Borys Filatov wrote on Telegram messenger.
Regional governor Sergiy Lysak wrote on Telegram that Ukraine forces had withstood an attack by "fascists, terrorists and subhumans". He said that 15 drones had been shot down.
He said a 25-year-old man was injured by a missile attack in one district and seven were injured in another district including two women in their 50s and 70s.
Ukraine's emergency service posted footage of fire stations with roofs blown off and fire engines torn apart.
It said one of its rescuers was injured, while three of its buildings and more than 20 pieces of equipment were destroyed.
Russia's night-time shelling of Ukraine has increased since the start of May, particularly targeting Kyiv.
Ukraine says that its air defences have been able to destroy most of the attack drones and missiles.
Zaporizhzhia nuclear plant cut off
Ukraine's occupied Zaporizhzhia nuclear plant has been cut off from the power grid again, its Russian administrators and the Ukrainian atomic agency said on Monday, a potentially dangerous incident that has become more frequent due to shelling.
"Due to a high-tension line being cut, the plant lost its external electricity supply," the Russian administration wrote on Telegram, adding the causes of the outage were being investigated and that backup diesel generators were keeping it working.
Ukraine's nuclear agency Energoatom accused Russia of carrying out an attack on Monday morning that caused the power cut, saying it was the seventh instance of the plant entering "blackout mode" since Moscow's troops took control in March 2022.
Energoatom said the generators had enough fuel reserves to last 10 days.
"If it is impossible to restore external power to the plant during this time, an accident with radiation consequences for the whole world may occur," it warned.
The governor of the Dnipro region said an overnight aerial attack had been reported and at least eight civilians injured.
The last power cut at Zaporizhzhia, Europe's largest nuclear plant located in southeastern Ukraine, had been caused by another wave of Russian missile attacks, Energoatom said.
The external power supply was restored after a few hours on that occasion.
The UN's nuclear chief Rafael Grossi, who has tried to negotiate with both sides to reach a deal on the safety of the plant, said it was the seventh power cut at the huge nuclear facility during the war.
"Nuclear safety situation at the plant extremely vulnerable," he said on Twitter.
"We must agree to protect plant now; this situation cannot continue."
Grossi visited the Moscow-occupied plant in March.
Zaporizhzhia used to supply around 20 per cent of Ukraine's electricity and continued to function in the early months of Russia's offensive despite frequent shelling, before halting power production in September.
None of its six Soviet-era reactors has since generated electricity, but the facility remains connected to the Ukrainian power grid for its own needs, notably to cool the reactors.
