President Volodymyr Zelenskyy said Tuesday that Russian strikes had destroyed about 30 percent of his country’s power plants in a week, speaking hours after a fresh barrage cut power to cities across Ukraine.

Russian attacks shook power plants in Kyiv and urban centers across the country, causing power outages and cutting off water supplies just a day after the capital was bombed by a swarm of suicide drones.

The strikes in the early hours of Tuesday hit Kyiv, Kharkiv in the east, Mykolayiv in the south and the central regions of Dnipro and Zhytomyr, where officials said hospitals were running on backup generators.

Drones bombed Kyiv on Monday, demolishing a central apartment building and killing five people in what the presidency called a desperate attack.

It was the second Monday in a row that Russia carried out punitive strikes, which military observers said appear to be Moscow’s response to battlefield casualties.

Zelenskyy called the repeated attacks on energy infrastructure “a different kind of Russian terrorist attack”.

“Since October 10, 30 percent of Ukraine’s power plants have been destroyed, leading to massive power outages across the country,” the Ukrainian leader said on Twitter.

He said the attack meant there was “no more room for negotiations with (President Vladimir) Putin’s regime.”

Many settlements in the Zhytomyr region west of Kyiv and parts of the city of Dnipro in central Ukraine were without power, while the southern city of Mykolayiv was restored to power after overnight strikes.

“Now the city is cut off from electricity and water supply. Hospitals are working on emergency power supplies,” Zhytomyr Mayor Sergiy Sukhomlyn said in an online statement.

In the northeast, meanwhile, Ukraine’s second largest city, Kharkiv, about 40 kilometers from the border with Russia, was hit by eight rockets, the regional governor said.

Kharkiv Mayor Igor Terekhov said an “industrial company” was hit.

In Kyiv, meanwhile, energy supplier DETK said its employees were “doing their best to restore power after the destruction of a critical infrastructure facility in the city of Kyiv.”

Zelensky previously said the new wave of nationwide strikes – which he says damaged an apartment building and a flower market in Mykolaiv – was a Russian attempt to “terrorize and kill civilians”.

“The terror state will not change anything for itself with such actions. He will only confirm his destructive and murderous nature, for which he will certainly be held accountable,” Zelenskyy said on social media.

There was no immediate response from Moscow, but it has said designated military targets were hit after similar attacks.

After the wave of kamikaze drone attacks on Kyiv on Monday, Foreign Minister Dmytro Kuleba called for EU sanctions on Iran and accused Tehran of supplying drones to Russia.

The Kremlin said Tuesday it was unaware of its army using Iranian drones in Ukraine.

“Russian technology is being used,” said Kremlin spokesman Dmitry Peskov, referring further questions to the Defense Ministry.

Iran has denied exporting arms to both sides, but the United States warned it would take action against companies and nations collaborating with Tehran’s drone program following the attacks in Kyiv.

Meanwhile, senior presidential adviser Mykhaylo Podolyak called for Russia to be excluded from the upcoming G20 summit.

As fighting continues across a sprawling frontline in eastern and southern Ukraine, the military said it shot down 38 Iranian-made Shahed-136 unmanned aerial vehicles in the past 24 hours.

Separately, Russian investigators said Tuesday they initially believed a military plane that crashed into an apartment building in the south of the country near Ukraine was the result of a technical malfunction.

Investigators said they were questioning the pilots of the Sukhoi Su-34, who managed to parachute out of the plane before it crashed into the nine-story building and engulfed it in flames on Monday night.