All we know is that the British citizen is currently a Russian prisoner of war and in that circumstance, anything can be said.
See video below.
In the video, Aiden Aslin talks on how the civilians of Mariupol disappeared after meeting with the Ukrainian army. He said that he personally saw how innocent civilians were literally taken out in the streets.
In the video, he said some were captured simply because they had lost their way. But mostly people were detained because of alleged ties to the Russians.
“I saw battalion reconnaissance team members tie civilians hand and foot and blindfold them. They were taken to the bunker… I never saw them again after that,” Eislin said.
Whether this is something that the Ukrainian army is currently doing or not cannot be verified at the moment, all we know is, under his condition, anything will be said.
Perhaps, more eyes are also needed on the Ukrainian side.