Russia launched 122 missiles and dozens of drones against Ukrainian targets, officials said on Friday, killing at least 27 civilians across the country in what an air force official called the biggest aerial barrage of the war.

At least 144 people were injured and an unknown number were buried under rubble during the roughly 18-hour onslaught, Ukrainian officials said. A maternity hospital, apartment blocks and schools were among the buildings reported damaged across Ukraine.

The Ukrainian air force intercepted most of the ballistic and cruise missiles and the Shahed-type drones overnight, said Ukraine’s military chief, Valerii Zaluzhnyi.

Western officials and analysts had recently warned that Russia limited its cruise missile strikes for months in an apparent effort to build up stockpiles for massive strikes during the winter, hoping to break the Ukrainians’ spirit.

The result was “the most massive aerial attack” since Russia’s full-scale invasion in February 2022, Air Force commander Mykola Oleshchuk said.

It topped the previous biggest assault, in November 2022 when Russia launched 96 missiles, and this year’s biggest, with 81 missiles on March 9, according to air force records.

Fighting along the front line is largely bogged down by winter weather after Ukraine’s summer counteroffensive failed to make a significant breakthrough along the roughly 1,000-km line of contact. Ukrainian officials have urged the country’s western allies to provide it with more air defenses. Their appeals have come as signs of war fatigue strain efforts to keep support in place.

British Prime Minister Rishi Sunak said the attack should stir the world to further action in support of Ukraine.

“These widespread attacks on Ukraine’s cities show (Russian President Vladimir) Putin will stop at nothing to achieve his aim of eradicating freedom and democracy,” Sunak said on social media platform X, formerly Twitter.

“We must continue to stand with Ukraine — for as long as it takes.” Ukrainian foreign minister Dmytro Kuleba said the scale of the attack should wake people up to Ukraine’s continuing needs.

“Today, millions of Ukrainians awoke to the loud sound of explosions,” he wrote on X.

“I wish those sounds of explosions in Ukraine could be heard all around the world. In all major capitals, headquarters, and parliaments, which are currently debating further support for Ukraine.”