Russian missiles have pounded power facilities in central and western Ukraine, increasing pressure on the ailing energy system as the country faces a shortage of air defences despite a breakthrough in US military aid.
The air strike, carried out with long-range missiles, including cruise missiles fired by Russian strategic bombers based in the Arctic Circle, was the fourth large-scale aerial assault targeting the power system since 22 March.
President Volodymyr Zelensky repeated a plea to partners for defensive missiles, notably the Patriot system.
He said the targets included electricity and gas transit facilities, in particular those important for gas supply to the European Union, though he did not say whether any such facilities were damaged.
Russia continues to supply gas to the EU via Ukraine under a transit deal with Russia's Gazprom that is set to expire in December and which Ukraine says it does not plan to extend.
"The enemy again massively shelled Ukrainian energy facilities," said DTEK, Ukraine's largest private electricity company, adding that four of its six thermal power plants had suffered damage overnight.
Rescuers battled to put out fires at several energy facilities in the western regions of Lviv and Ivano-Frankivsk, which border NATO members Poland and Romania, officials said.
After strikes on energy facilities in the central Dnipropetrovsk region, running water supplies were disrupted in President Volodymyr Zelensky's hometown of Kryvyi Rih, officials said.
Ukrainian air defences brought down 21 of the 34 incoming missiles, the commander of the air force said in a statement.
None of the facilities hit was identified by name, a security measure intended to prevent Russia quickly assessing the impact of its strikes.
Mr Zelensky said the trajectories and nature of the attack had been calculated to make preventing it as hard as possible.
"Each downed rocket today is a significant result," he said.
Ukraine's state-run oil and gas firm Naftogaz said Russiah ad attacked its facilities but that no-one was hurt and supplies to Ukrainian consumers and clients were unaffected.
Russia, which began its full-scale invasion of Ukraine in February 2022, denies targeting civilians but says the Ukrainian energy system is a legitimate military target.
Ukrainian authorities said one energy worker was hurt overnight.
In the northeastern city of Kharkiv, which has been heavily bombed in recent weeks, a missile struck a hospital holding 60 patients overnight, injuring a woman and damaging the building, nearby water pipes and power lines, the regional governor said.
Ukraine, which has tried to take the fight back to Russia in recent months using long-range drones, attacked the Ilsky and Slavyansk oil refineries in Russia's Krasnodar region overnight, a Ukrainian intelligence source told Reuters.
The drone strike conducted by the SBU security service caused fires at the facilities, the source said.
Russia's Kushchevsk military airfield was also attacked in the southern region, the source added.
The Slavyansk oil refinery was forced to suspend some operations after being damaged in the attack, Russian state news agency TASS cited an executive overseeing the plant as saying.
Rolling blackouts
Ukraine has lost 80% of its thermal power generation and 35% of its hydroelectric capacity during Russian attacks, officials say.
Though the core of the energy system comes from nuclear power, that lost capacity serves a balancing function in the grid and its loss could be a big problem when consumption rises later this year, officials say.
Rolling blackouts have been introduced in several regions, but the full impact of the attacks has not been felt as consumption, which peaks in winter and the height of summer, is low because of mild weather.
There were no planned blackouts for now in Lviv region, but the governor urged residents to economise on electricity use, especially during the evening hours of peak consumption.
He said the two critical energy infrastructure objects in Stryi and Chervonohrad districts were damaged in today's attack.
Mr Zelensky called for more air defence supplies, faster deliveries and decisive actions from Kyiv's allies.
The United States approved a major aid package for Ukraine this week, overcoming a congressional deadlock that dragged on for six months as Kyiv's weapon stocks became depleted.
The Pentagon said on Friday it would buy $6 billion worth of new weapons for Ukraine including interceptors for the Patriot air defence system.
Australian Defence Minister Richard Marles, who visited Lviv today, announced a $100 million military aid package including short-range air defence and drones with air-to-ground precision munitions coming separately.
No grounds for peace talks with Ukraine, says Kremlin
There are currently no grounds for peace talks between Russia and Ukraine due to Kyiv's formal refusal to negotiate with Moscow, Kremlin spokesman Dmitry Peskov said earlier.
Mr Zelensky signed a decree in 2022 formally declaring the prospect of any Ukrainian talks with Kremlin leader Vladimir Putin "impossible", while leaving the door open to talks with what he called "another president of Russia".
Meanwhile, the Kremlin has said that Russia will look for ways to overcome what it regards as any illegal sanctions the European Union imposes on its liquified natural gas (LNG) operations.
The European Commission's next sanctions package is expected to propose restrictions on Russian liquefied natural gas for the first time, including a ban on trans-shipments in the EU and measures on three Russian LNG projects, three EU sources said on Thursday.
Mr Peskov said any new EU restrictions would benefit the United States and would mean European industry pays more for its gas.
