Serhiy Haidai, head of the regional military administration, said a woman died in shelling that hit the hospital in Severodonetsk, a city that has seen widespread destruction after weeks of attacks.

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"They wanted to finish off the wounded," Haidai said. "The Russians knew that the hospital was not empty, there were patients in different conditions with doctors; it did not stop them."

"The destruction of the building is significant. Several floors were damaged at once," he added.