Well imagine that, for some reason, the Iranians are not too far from Bagdad. A desesperate Saddam ask Chirac another weapon (he had all the weapon he liked) : just one AN-52 nuclear bomb to repeal the Iranians.
At the time in 1986 the iranians made a series of deadly attacks in Paris killing many people.
As revenge Chirac agree and give Saddam a single AN-52 tactical nuke to be use from the Mirage F1EQ.
Iranians are nuked. Saddam win.
Why ask the mayor of Paris?
It is difficult to see where Iran could get arms from anyway although China may have been a possibility.
India, since Saddam's friendly with Pakistan (I think).
Israel, as they did historically.
Libya and Syria, who broke ranks with the Arab world by backing Iran.
The Soviet Union, if Saddam becomes too friendly with the West and/or in exchange for Iranian non-interference in Afghanistan. Wiki says they did provide some limited support.
Argentina, Brazil, Bulgaria, China, East and West Germany, North Korea, Pakistan, Poland, Portugal, Romania, Taiwan, and Yugoslavia, according to wiki.
Algeria, Greece, South Africa, South Korea, South Yemen, Switzerland, and Vietnam, according to
this site (there's some disagreement with wiki).
Albania, Burma, Cyprus, Mexico, Sweden, Venezuela, Zaire, and Zimbabwe, as a sign of non-alignment (both superpowers support Iraq).
Note that there's nothing stopping a country from selling arms to both sides, and I'd be surprised if none of those mentioned did. There are many whose interests would not be damaged by selling to Iran, the only question being one of payment.