Ukraine accused Russia on Saturday of striking a military hospital in the northeastern city of Kharkiv, damaging the building and wounding military personnel undergoing treatment, which it condemned as a war crime.
Kyiv does not typically reveal data on military casualties and did not say how many soldiers were wounded.
"The hospital building and nearby residential buildings were damaged by a Shahed drone," the Ukrainian army said in a statement.
"According to preliminary reports, there are casualties among the military personnel who were undergoing treatment at the medical centre," it added.
It accused Russia of having carried out a "war crime" and "violating the norms of international humanitarian law".
The accusation comes as US President Donald Trump's administration pushes for a speedy end to the more than three-year war, holding talks with both Russian and Ukrainian officials.
The talks have not yet yielded a breakthrough, despite the two sides agreeing to the concept of a Black Sea truce earlier this week.
