Strategikon, a practical military manual of lasting influence, is attributed to Maurice (r. 582–602), last of the Justinian emperors of Byzantine. His chapter on the Persians (Iranians) is revealing of mindset vis-à-vis Iranian fortitude and patience; and military and diplomatic strategies. This holds true today. I have reproduced in pertinent part two paragraphs from Strategikon with annotations that relate to the current military situation.