Ukrainian President Volodymyr Zelensky said "Russian troops have destroyed or damaged almost 400 health facilities," during his address to Ukrainians on Thursday night.
He said this was based on "only the medical infrastructure," and that the facilities affected included "hospitals, maternity hospitals, outpatient clinics."
"In the temporarily occupied areas of Ukraine -- in the east and south -- the situation with access to medical services and medicines is just catastrophic," Zelensky said, adding that "even the simplest medications are missing."
The President also highlighted the "complete lack of treatment for cancer patients," as well as "a lack of antibiotics" and "difficult or impossible" lack of access to insulin.
Russia's attack on a maternity and children's hospital in Mariupol on March 9 has been one of the most reported incidents to date during the ongoing invasion.
At least five people were killed and at least 17 were injured, including children.
Two hospitals in Zhytomyr, west of the capital, Kyiv, had their windows blown out in a Russian airstrike on a thermal power plant and civilian building in the city on the same day, the mayor said. One of them was a children's hospital.
The rules of war specify that civilians should not be targeted and that medical workers, medical vehicles and hospitals dedicated to humanitarian work cannot be attacked.