Please apply some critical thinking yourself - firstly familiarise yourself with what a platoon is! Why might they surrender... perhaps they were cut off from friendly forces... They're a small unit, a recce platoon, they operate in advance of larger formations. This isn't too hard to follow why they might be captured.
Some reports that they're feeling a bit disillusioned, I'd perhaps take these with a pinch of salt though it's worth remembering that back in Soviet times it wasn't uncommon for Russian troops from say the far East being sent to Hungary or (then) Czechoslovakia would be shocked to find that they weren't welcomed as fellow comrades/liberators upon arrival:
I get the feeling a lot of these troops weren't under the impression they'd be actually going into Ukraine any time soon.