Kyiv, Ukraine – Earth-shattering blasts shook Oleksandra’s apartment building on Monday morning, sending dagger-like shards of glass flying around. Hours later, she is still shaking, but it is not the damage to her two-bedroom apartment that shocked her. "We can always have the windows replaced," she told Al Jazeera, clutching a cigarette and sitting next to her elderly father on a bench near the building in central Kyiv. It was the damage done to Okhmatdyt, Ukraine’s largest children’s hospital, a sprawling complex that is just meters away from her apartment. Thousands of children, including those with cancer, undergo treatment at the hospital every year. A Russian hypersonic missile struck the complex on Monday morning, hitting a two-story toxicology department where children undergo dialysis, officials said. The building’s roof collapsed, killing at least two hospital workers. One victim is understood to have been a doctor. At least 16 people were wounded, including seven children, officials said. "I am feeling so down," Oleksandra said, pointing at the hospital as it was still surrounded by a cloud of dust as bulldozers removed the debris. "They saved my son there two years ago, and now I see this," she said as dozens of volunteers rushed around, handing out bottled water, food, and fruit to the children from pick-up trucks and buses. "They are children, just little ones. We see them every day. Some have cancer," she said. The hospital attack was part of a Russian barrage. Moscow launched three dozen missiles on several Ukrainian cities. At the time of writing, at least 36 people were reported to have been killed and 125 wounded, but the toll is expected to rise. "There are still some children trapped under the debris," a rescue worker told Al Jazeera four hours after the strike. Russia denies responsibility Russia habitually denies targeting civilian infrastructure. It claimed the hospital was hit by a Ukrainian air defense missile. "But military analysts are adamant that the attack on Okhmatdyt was deliberate." They used the "whole spectrum" of missiles backed by Iranian-made Shaheed drones and "struck during daytime to exert moral and psychological pressure," said Lieutenant General Ihor Romanenko, former deputy head of the General Staff of the Ukrainian Armed Forces. "Ukrainians who have lived through years of bombardment agree that the assault was no mistake." "Those were hits, not midair collisions" with air defense missiles, said Serhiy, a construction engineer who witnessed hits on the Artyom military plant, which is about a kilometer away from the Okhmatdyt hospital. Russia’s missiles 'harder to identify and destroy' Minutes later, a second air raid alert sent rescue workers, police officers, and civilians to an underground passage. Even though advanced Western air defense systems protect Kyiv from most of the Russian missiles and drones, Moscow keeps "improving" its bombardment tactics, Ukraine’s air force spokesman said. "Russia’s missiles are 'harder to identify and destroy,'" Yuri Ihnat wrote on Facebook. For many in Ukraine, the hospital bombing epitomizes Russia’s ruthlessness. Civilian sites, including schools, hospitals, railway stations, and bomb shelters, have been struck throughout the war, now in its third year. "We must hold Russia accountable for its acts of terror and Putin for ordering the strikes," Ukrainian President Volodymyr Zelenskyy said in a post. "Every time there are attempts to discuss peace with Putin, Russia responds with attacks on homes and hospitals," he said, adding that Kyiv is initiating an emergency meeting of the United Nations Security Council to discuss the bombing.