Yup, that’s a flying barn. That’s what some pilots refer to it as in Russian. “сарай”.
It may have long, flat sides. It may even have a cargo door in the rear large enough to drive a tractor into. Let’s not forget that this is a helicopter. Not just any helicopter, either.
This is the Mil Mi-26. Specifically an Mi-26T. This one is based at Lipki Airfield on the east side of Minsk, home of a detachment of pilots and other staff who work for the Ministry for Emergency Situations of the Republic of Belarus.