What does instex trade in, Rroff? Food and medicine which are not prohibited by unilateral US sanctions anyway. The Iranians have asked for it to include oil sales, which would fall foul of unilateral US sanctions, and the EU has refused hence it is useless.
Keep up.
Why avoid the key factor there? the avenue of non-Dollar trading. Moot point if those things are sanctioned or not if Iran doesn't have access to the financial services needed to pay for them due to US cutting them off.