Iraq, which has called the dollar the currency of its “enemy state,” informed oil customers earlier this month to start making payments in euros, beginning November 1. Baghdad also has threatened to stop oil exports, the bulk of which flows through the UN humanitarian program, if its request for payment in the euro is denied.

https://gulfnews.com/business/energy/un-says-iraq-switch-to-euros-would-be-costly-1.433781

After the invasion it switched back to the us dollar. https://medium.com/%40gsaidheeraj/from-saddam-to-maduro-the-hidden-cost-of-pricing-oil-beyond-the-dollar-2b9e373cc944

It’s certainly a coincidence. I’m sure it’s not a justification for war, or even a threat of war.