More in the nature of a raid than an invasion.
But certainly a hostile violation of the target county’s borders and sovereignty by whatever name.
Seems to me that the threat of invasion would motivate you to work even harder on keeping the water flowing. Water management is a matter of strategic importance - there are few things more crucial in times of war.
No, it looks like the biggest problem here is that Iran really, really needs to modernize its agriculture, and start recycling water.