"Konashenkov said the Russian army would return Ukrainian prisoners of war "who surrender" to their families." - I read this as, "and vaporize those who do not in a mobile crematorium".

In case you are wondering about the mobile crematorium reference:

"Russia deploys mobile crematoriums to follow its troops into battle" https://www.telegraph.co.uk/world-news/2022/02/23/russia-dep...

Reports (to be confirmed by other sources):

"...3,500 Russian soldiers were killed, and almost 200 more were captured..."

https://www.moscowtimes.ru/2022/02/27/minoboroni-vpervie-pri...

Those numbers were from Ukrainian authorities. Moscow has confirmed killed and captured but did not disclose numbers.