>We prepared for the combat use of these modules for a very long time. It was a very difficult sector on which the enemy was constantly conducting assault actions. That's why the infantry needed reinforcements. But the robot drone didn't just drive onto the position for a day. Instead of real fighters, an iron one held the line for a month and a half and actually fooled the Russians because they didn't even think about something like this. (https://youtu.be/Ir6sNgW91Hw?t=226)
"Very difficult" and constants assaults doesn't sound like what you describe.
I have to say if I was defending against Russians trying to kill me I'd much rather operate the gun remotely from behind a hill than sit there in range.