The International Atomic Energy Agency said on Saturday that Ukraine's Zaporizhzhia nuclear power plant lost off-site power for the 20th time during the conflict with Russia due to an issue with the site's internal power lines affecting its only remaining 330 kV connection, Ferosplavna-1.

Emergency diesel generators were activated to maintain reactor cooling and other essential nuclear safety functions, the agency said in a post on X.

Four and a half hours later, the Zaporizhzhia nuclear power plant has been reconnected to the electrical grid, according to the IAEA.

The atomic body said power was restored at 5:50 p.m. local time on Saturday, bringing an end to the latest loss of off-site electricity at the facility.

Meanwhile, Regional Governor Ivan Fedorov in Zaporizhzhia said Russian forces struck the city with glide bombs, killing four people and injuring six.

Fedorov said on Telegram that there had been nine strikes in Zaporizhzhia. He added residents could well be trapped in the rubble of damaged buildings.

Ukraine also continued its attacks, launching drones targeting an oil refinery in Russia's Tyumen region for the first time since the start of the conflict, regional Governor Alexander Moor said on Saturday.

Russia said air defences had repelled the attack on the Tyumen oil refinery, one of Russia's largest refining facilities.

Separately, tensions emerged between Kiev and Warsaw over historical memory.

Ukrainian President Volodymyr Zelenskyy said he had returned Poland’s highest state honour, the Order of the White Eagle, to his Polish counterpart, Karol Nawrocki, who revoked the award amid a dispute over historical memory.

Nawrocki on Friday revoked the Order of the White Eagle following outrage in Poland over Kiev’s recent move to name a military unit after the Ukrainian Insurgent Army (UPA), a nationalist formation that Polish historians and officials hold responsible for the mass killing of tens of thousands of Polish civilians in Volhynia and Eastern Galicia during World War II.

Zelenskyy underlined that the award, which represents Poland’s highest honour, requires “not only merit but also respect for the values that form the foundation of our community”.

“Therefore, if it is considered that this special symbol may remain with Catherine II, Benito Mussolini, and Gerhard Schroder, then we in Ukraine will not argue with that,” he wrote on the US social media platform X.