DNIPRO, Ukraine >> The death toll from the Ukraine war’s deadliest attack on civilians at one location since last spring reached 45 at an apartment building a Russian missile blasted in the southeastern city of Dnipro, officials said Tuesday.

Those killed in the Saturday afternoon strike included six children, with 79 people injured, President Volodymyr Zelenskyy wrote on the Telegram messaging app. The toll included two dozen people initially listed as missing at the multistory building, which housed about 1,700, according to Kyrylo Tymoshenko, deputy head of the Ukrainian president’s office.

Emergency crews cleared some 9 metric tons (9.9 tons) of rubble during a non-stop search and rescue operation, the Dnipro City Council said. About 400 people lost their homes, with 72 apartments completely ruined and another 236 damaged beyond repair, it added.

People converged at the site Tuesday to lay flowers, light candles and bring plush toys. For a third day in a row, Dnipro resident Oleksandr Pohorielov came to mourn.

“It’s like coming to the cemetery to your family. It’s a memory, to say a proper goodbye. To remain a human after all,” he explained as an intense reek of burning emanated from the building’s ruins.

Volunteers helped Nadiia Yaroshenko’s son escape from their third floor apartment on a makeshift ladder but their white cat Beliash refused to leave. He remains in his favorite place at a window that is now blown out, Yaroshenko said, desperately trying to see him from the courtyard with a flashlight.

“We cannot reach the apartment even with rescuers because the apartment is in an emergency and dangerous condition. Walls could collapse there every minute,” she said.

The latest deadly Russian strike on a civilian target in the almost 11-month wa r triggered outrage. It also prompted the surprise resignation on Tuesday of a Ukrainian presidential adviser who had said the Russian missile exploded and fell after the Ukrainian air defense system shot it down, a version that would take some of the blame off the Kremlin’s forces.

Oleksii Arestovych’s comments in a Saturday interview caused an outcry. He said as he quit that his remarks were “a fundamental mistake.” Ukraine’s air force had stressed that the country’s military did not have a system that could down Russia’s Kh-22 supersonic missiles, the type that hit the apartment building.

Zelenskyy vowed “to ensure that all Russian murderers, everyone who gives and executes orders on missile terror against our people, face legal sentences. And to ensure that they serve their punishment.”

The British Defense Ministry said Tuesday that the weekend barrage of long-range missiles, the first of its kind in two weeks, targeted Ukraine’s power grid.

The Kh-22 was designed during Soviet times to strike enemy ships. It can also be used against ground targets, but with much less precision. Observers have said that Russia has increasingly used older weapons, including those intended for other purposes, to attack targets in Ukraine in what could be a sign of the depletion of Russian stockpiles of modern precision weapons. The U.K. ministry noted that the Kh-22 “is notoriously inaccurate when used against ground targets as its radar guidance system is poor at differentiating targets in urban areas,” suggesting that might have been a factor in the deaths in the Dnipro.

Similar missiles were used in other incidents that caused high civilian casualties, it said, including a strike on a shopping mall in Ukraine’s central city of Kremenchuk in June that officials said killed more than 20 people.

The deadliest attack involving civilians before Saturday was an April 9 strike on a train station in the eastern city of Kramatorsk that left at least 52 people dead, according to The Associated Press-Frontline War Crimes Watch project.

In Moscow, a makeshift memorial to the Dnipro attack’s victims appeared in front of an apartment building, an unusual act in Russia, where even a hint of criticism of the government’s “special military operation” in Ukraine is often suppressed. Amid snow, flowers and toy stuffed animals were laid at the monument of prominent Ukrainian writer Lesya Ukrainka, along with a photo of the destroyed building and a sign that read in Russian: “Dnipro. 14.01.2023.”

Attacks on civilians have helped stiffen international support for Ukraine as it battles to fend off the Kremlin’s invasion. The winter has brought a slowdown in fighting, but military analysts say a new push by both sides is likely once the weather improves.

Underscoring Russia’s growing military needs, Defense Minister Sergei Shoigu said Tuesday that the country’s military would increase the number of troops from 1.15 million to 1.5 million in the coming years.

As part of the buildup, the military will form an army corps in the northwestern region of Karelia, near Finland, as well as three new motorized infantry and two airborne divisions. The military will also beef up seven motorized infantry brigades into divisions.

On the side of Ukraine, the top U.S. military officer, Army Gen. Mark Milley, traveled to the Ukraine-Poland border on Tuesday to meet with his Ukrainian counterpart for the first time. Milley, the chairman of the Joint Chiefs of Staff, met with Gen. Valerii Zaluzhnyi, in southeastern Poland. On Monday, Milley visited troops from Ukraine training at a military base in Germany under U.S. commanders.

Aid is also on the way from the Netherlands. Prime Minister Mark Rutte said Tuesday in Washington that his country plans to “join” the U.S. and Germany’s efforts to train and arm Ukraine with advanced Patriot missile defense systems.

It remains unclear if the Dutch will ultimately send Patriot systems, although Zelenskyy said in his nightly address Tuesday that the Netherlands had agreed to send Ukraine a battery of the equipment. “So, there are now three guaranteed batteries. But this is only the beginning. We are working on new solutions to strengthen our air defense,” Zelenskyy said.

Ukrainian troops are at Oklahoma’s Fort Sill Army base learning how to operate and maintain the Patriot, the most advanced surface-to-air missile system the West has pledged to provide to Ukraine to help repel Russian aerial attacks.

Ukraine’s first lady was doing her part Tuesday to help. She pressed world leaders and corporate executives at the World Economic Forum’s annual gathering in Switzerland to exercise their influence against a Russian invasion she said is leaving children dying and the world struggling with food insecurity.

As the first anniversary of the war nears, Olena Zelenska said parents in Ukraine are in tears watching doctors trying to save their children, farmers are afraid to return to their fields filled with mines and “we cannot allow a new Chernobyl to happen,” referring to the 1986 nuclear power plant disaster.

“What you all have in common is that you are genuinely influential,” Zelenska told attendees. “But there is something that separates you, namely that not all of you use this influence, or sometimes use it in a way that separates you even more.”

Meanwhile, the head of the U.N. nuclear agency is visiting several of Ukraine’s four nuclear power plants this week to oversee the establishment of a permanent presence of inspectors at each of them to oversee operations and ensure safety.

Rafael Grossi, director-general of the International Atomic Energy Agency, said Tuesday the missions “will make a very real difference through supporting the Ukrainian operators and regulator in fulfilling their national responsibility of ensuring nuclear safety and security.”