On 13th November, the European Parliament Research Service published a briefing paper on steps to alleviate the effects of US sanctions on European firms, with the creation of a new mechanism as a special purpose vehicle (SPV), to facilitate financial transactions with Iran.
http://www.europarl.europa.eu/RegData/etudes/ATAG/2018/630273/EPRS_ATA(2018)630273_EN.pdf