Send them pork MREs, then expired MREs. Eventually they will surrender.
I seem to recall the least favorite MRE in Desert Storm (at least for me) was the BBQ Pork and Rice. The Saudi guards would always steal our food on the gate, so one day I picked up the pork and left it out. Sure enough one of the guards started eating it. That was the last time they stole our food. They also had to keep me away from that post…that guard was going to kill me!