The doors swing opengvg777, and two figures emerge from a nondescript building. A scooter is propped against the front wall. A man identified by Russia as Igor Kirillov, a high-ranking general, takes a few steps forward.

Then the screen, framed by the dash of a car, erupts into a flash of white.

A video that an official with Ukraine’s security service shared with The New York Times and other news outlets, recorded from the interior of a car, appears to show the moment that an explosion killed General Kirillov and an aide as they walked out onto a snowy Moscow street.

Disciplinary proceedings against Dr. Wax tested the tenure protections of professors and whether such protections allow them to voice opinions that many might find inappropriate or downright insulting. Many students said that they could not trust Dr. Wax to grade students without bias. But many professors — even those who found her comments profoundly racist — objected to disciplining her on the grounds of academic freedom.

The accountability office said many of those systems “have critical operational impacts” on air traffic safety and efficiency. Many of them are also facing “challenges that are historically problematic for aging systems,” according to the report.

General Kirillov oversaw the Russian military’s nuclear and chemical weapons protection forces before he was assassinated on Tuesday.

An official with Ukraine’s security service, known as the S.B.U., said that Kyiv was responsible for the killing.

The Times verified that the video had been recorded from a vehicle used for short-term rentals and matched the details in the footage with the location and the time of General Kirillov’s killing.

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