Empty strollers sit in a square in Lviv to remember the children killed in Russia's ongoing invasion of Ukraine.
RELATED: Ukrainian families say goodbye or fight back as Russia moves into west
The fighting has led more than 3.27 million people to flee Ukraine, the U.N. estimates. More than 2 million people have gone to Poland, the country's border agency said Friday. The death toll remains unknown, though Ukraine has said thousands of civilians have died.
Among the most condemned attacks of the Russian invasion was last week's airstrike on a maternity hospital in Mariupol that killed three people and left 17 injured.
The World Health Organization says that's just one of 43 confirmed attacks on hospitals and health care facilities by Russian forces since the war began. Those aggressions have killed 12 and injured 34.
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