«Ukrainian forces set fire to grain fields around Mariupol so they could not be “stolen by the occupiers”, Sergiy Bratchuk, a spokesman for the Odesa regional military administration said».
Apparently this is what you do these days to prove you care about local farmers and global food security.
https://www.theguardian.com/world/2022/jul/30/volodymyr-zelenskiy-orders-evacuation-of-donetsk-region