But the scope of the inquiry has so far been limited to seven sites among the many targeted, according to an internal U.N. document seen by The Times.

And diplomats say Russia has been pressing the global organization’s leader, Secretary General António Guterres, not to release the conclusions of even the narrowed inquiry.

Times investigation: Our video team pored through witness accounts and videos, time-coded cockpit recordings of Russian pilots, plane spotter logs and security camera footage to show that one of the hospitals — an underground facility that The Times found had been bombed by Russian pilots at least once before — was bombed by the Russians again last week.