It is the last time the men would be seen alive: In two videos, Russian paratroopers march them at gunpoint along a street in Bucha, a suburb of Kyiv. Some of the Ukrainian captives are hunched over, holding the belts of those in front of them. Others have their hands over their heads. ¡°Walk to the right, bitch,¡± one of the soldiers orders them.

The videos, filmed March 4 by a security camera and a witness in a nearby house and obtained by The New York Times, are the clearest evidence yet that the men were in the custody of Russian troops minutes before being executed.

¡°Hostages are lying there, against the fence,¡± the person filming one of the videos says. He counts: ¡°One, two, three, for sure, four, five, six ... ¡± In total, nine people are being held.