Nothing changes

Iran has been under sanctions for many years - and they are producing drones. And Russia is richer in resources. And not all brains leave.

There will always be an opportunity to somehow and somewhere bring something (I'm talking about the military industry). And the state has money.

A foreign company will not tell a random Ivan - "Hey Ivan, come to work with us, here's your housing for the first year. Here's help for you, better work with us"

So Ivan will go to his job tomorrow and pay his taxes, even if he would very much like to leave.