KYIV, Ukraine — Russia has launched a counteroffensive in its Kursk region to dislodge Ukraine’s forces who stormed across the border five weeks ago and put Russian territory under foreign occupation for the first time since World War II, Ukraine’s president said Thursday.

Russia’s Defense Ministry said Moscow’s forces had recaptured 10 settlements in Kursk and listed their names but didn’t describe the fighting as a counteroffensive. Ukrainian President Volodymyr Zelenskyy said Russia was taking “counteroffensive actions,” but Ukrainian forces had anticipated the moves.

Ukraine launched its daring incursion into Kursk on Aug. 6, partly in the hope that Russia would divert its troops there from Donetsk in eastern Ukraine, where a push by the Russian army is threatening to overrun a belt of key defensive strongholds.

The cross-border operation also raised Ukrainian morale after months of gloomy news from the front by exposing Russian vulnerabilities and seizing some initiative on the battlefield. It also sought to establish a buffer zone to prevent Russian attacks.

Moscow’s muddled response suggested that Russia hadn’t planned for such a development and was caught by surprise. Assembling forces for a counterattack, given the long distances involved and other demands along the 600-mile front line, was expected to take some time.

The Russian army has been hacking its way deeper into eastern Ukraine, especially Donetsk, and has battered Ukrainian territory with relentless missile and drone attacks.

A Russian missile attack Thursday killed three people and injured two, all of them Ukrainian workers with the International Committee of the Red Cross, said Dmytro Lubinets, Ukraine’s human rights ombudsman.

The toll was the largest among staffers at the Geneva- based humanitarian organization since a bomb blast killed three at the Aden airport in Yemen in 2020.

The eastern Ukraine city of Pokrovsk is without a drinking water supply or natural gas for cooking and heating, authorities said, as the Russian army’s attritional slog across the Donetsk region lays waste to public infrastructure and forces civilians to flee their homes.

A water filtration station in Pokrovsk was damaged in recent fighting, and more than 300 hastily drilled water wells are the city’s last source of drinking water, regional Gov. Vadym Filashkin said.

The previous day, Russians destroyed a natural gas distribution station near Pokrovsk, Filashkin said. About 18,000 people remain in the city, including 522 children. More than 20,000 people have left in the past six weeks as Russian forces creep closer to residential areas.

“Evacuation is the only … choice for civilians,” he said.

Pokrovsk is one of Ukraine’s main defensive strongholds and a key logistics hub in the Donetsk region. Its capture would compromise Ukraine’s defensive abilities and supply routes and would bring Russia closer to its stated goal of capturing the region, which it partially occupies.

Russian troops backed by artillery and powerful glide bombs have turned Donetsk cities and towns such as Bakhmut and Avdiivka into bombed-out shells, although the push has cost Russia heavily in troops and armor.

U.S. Secretary of State Antony Blinken ended a Ukraine-focused European tour Thursday after hearing repeated appeals from Ukrainian officials to use Western-supplied weaponry for long-range strikes inside Russia.

President Joe Biden has allowed Ukraine to fire U.S.-provided missiles across the border in self-defense but has largely limited the distance they can be fired.

Russian President Vladimir Putin in turn warned that allowing long-range strikes “would mean that NATO countries, the United States and European countries are at war with Russia ... if this is so, then, bearing in mind the change in the very essence of this conflict, we will make appropriate decisions based on the threats that will be created for us.”

Ukrainian forces have held out as long as possible in Donetsk, even when strongholds appeared to be in danger of imminent collapse.

Russia has fired missiles especially at the power grid, potentially dooming Ukrainians to a bitterly cold winter.

The U.S. and Britain pledged nearly $1.5 billion in additional aid Wednesday to Ukraine during a visit to Kyiv by their top diplomats. Much of that will go to restoring the electricity supply.