The Mirage 4000 was developed using Dassault's own funds. Saudi Arabia and Iran did not finance it, but I have a little anecdote to share with you:I think some (a lot?) folks might know this. During late 70s (around 79), france was building Mirage-4000 jet. Think it as Su-30 (or F-15) but french and having same lineage as M-2000. The prototype was extremely interesting and really great. It was never finished because... the two customer who were funding a lot of it (Iran then under Shah and Saudi Arabia) withdrew... I wonder if we could have stepped up. We bought a lot of Mirages in 1980 from France.
If we could have worked out something, we would be flying a jet with commonality (engine and weapons) with M-2000 by 1990 latest, having western radar and weapons and above all a very reliable and powerful engine. With upgrade path likely, we could have introduced AESA radar equipped heavy fighter at a later date...
France did not have a requirement for a heavy and long range plane like this but it might have bought something.
To top it all M-4000 looks absolutely beautiful dazzling.
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One day Marcel Dassault received a phone call in the middle of the night and it was the King of Saudi Arabia, who told him that he wanted to buy Mirage 4000s and that a demonstration had to be organised as a matter of urgency for his Minister of Defence. The demonstration was organised the second day in the morning and everything went well, so well in fact that Saudi Arabia agreed to buy the aircraft!
But the formalities had to be completed and the French Navy vetoed the purchase: the aircraft was too dangerous for the French navy in the Mediterranean.
Since then, we've had a bit of trouble selling fighter planes to Saudi Arabia.