Ukraine mourns following a day of Russian air attacks.
A children's hospital in Kyiv was among the buildings destroyed in Monday's missile strike.
A day of mourning has been marked in Ukraine following one of the heaviest rounds of Russian missile strikes in months, which killed at least 41 people and injured 166 others.
The largest children's hospital in Kyiv, the capital, was among the structures struck across the country on Monday.
on other news, the governor of the southern Russian region of Belgorod, which borders Ukraine, reported that four people had perished on the previous day as a result of strikes by Ukrainians.
On Monday, Ukraine claimed to have discovered pieces of a Russian cruise missile, but Russia denied targeting the hospital in Kyiv and claimed it had instead been hit by pieces of a Ukrainian air defense missile.
"Brutal" was how Ukrainian President Volodymyr Zelensky characterized the incident, and he dubbed Russian President Vladimir Putin a "bloody criminal".
NATO is getting ready for a summit that will take place in Washington later on Tuesday, with a major focus being the military alliance's response to the invasion of Ukraine.
Youngsters waiting outside the hospital with IV drips International leaders who support Ukraine have denounced the incident, among them Sir Keir Starmer, the recently appointed prime minister of Britain.
He declared that "attacking innocent kids" was "the most depraved of actions" and pledged to help Kyiv in the wake of the UK's government transition.
US President Joe Biden declared that further support for Ukraine's air defense systems would be disclosed shortly, referring to the strikes as a "horrific reminder of Russia's brutality".
According to Mr. Zelensky, Russia launched more than 40 missiles on Monday, causing damage to about 100 structures in Dnipro, Kramatorsk, Kyiv, Kryvyi Rih, and Sloviansk.
Pictures from the scene of the bomb at the Kyiv hospital, which specializes in cancer treatment and organ transplants, showed children hooked up to IV drips waiting outside the damaged facility for evacuation.
Rescue personnel and medics combed through the rubble to find survivors, but it was unclear how many were remained trapped.
On Monday afternoon, Kyiv Mayor Vitali Klitschko announced that 16 individuals, including seven children, had been hurt in the hospital strike.
He claimed the strikes around the city were among the worst Kyiv had seen since the beginning of the war, ordering flags to be flown at half-mast on Tuesday and canceling entertainment activities.
Following the strike, Ukrainian tennis star Elina Svitolina wore a black ribbon as a symbol of respect when she competed in the Wimbledon round of 16 on Monday afternoon.
Elina Svitolina at Wimbledon.
During her post-match interview, she fought back tears and stated, "It was not easy to focus today on the match.
"Since the morning, it has been impossible to read the news. "Going on the court is extremely difficult." According to the United Nations' human rights monitoring mission in Ukraine, civilian casualties have increased in recent months as Russia resumed its air campaign.
A recent analysis stated that May was the bloodiest month for civilian deaths in nearly a year. On Tuesday morning, the governor of the Rostov area in southern Russia reported that a fire had broken out at a power station after Ukraine launched "tens" of drones.
