Long term rivals, the two nations have seen tensions escalate in recent days after a series of explosive incidents.
The latest has seen Saudi Crown prince Mohammed bin Salman accuse Iran of arming militias – something he warned could be considered “an act of war”.
It comes after Saudi Arabia intercepted a rocket fired by militia near the airport in its capital city, something they blamed Iran for.
Meanwhile Iran has done little to calm the situation, mocking Saudi Arabia and accusing it of hypocrisy.
Iran’s Foreign Minister Mohammad Javad Zarif posted on Twitter this week: “KSA bombs Yemen to smithereens, killing 1000s of innocents including babies, spreads cholera and famine, but of course blames Iran.
“KSA is engaged in wars of aggression, regional bullying, destabilising behaviour & risky provocations. It blames Iran for the consequences.”
Both states are refusing to back down in the face of looming war – but who is in better shape if all-out conflict does break out?