Iran announces first joint military drills with Saudi Arabia in Red Sea [Saudi confirmation still needed]

Iran and Saudi really don't give each other much in regards of "brutal regime".

Both countries executed hundreds of people every year, violently suppress dissidents, deny womens rights...

This definitely seems like one of those "enemy of my enemy is a friend" sort of deals

It is unclear how much it actually involved Iran. Also we need to keep in mind that China managed to get Iran and Saudi Arabia together into the BRICS. So i am skeptical how much this coopfration is by Irans design.

I hope that Saudi Arabia and Iran move towards a constructive cooperation. The West Asia and North East Africa regions cannot be shaped with ignoring eithers interests, which is a fatal or deliberate mistake of the Western countries, destabilizing the region.

That is not to say either regime is particularly "nice" to their people or people in the countries they exert influence on. But a stable external security and economic development can allow for more relaxation internally. The idea to keep on "regime change" by force has never achieved a better leader and often not even a better ally for the West in these regions.