http://www.tehrantimes.com/news/424089/Is-Europe-really-struggling-to-maintain-JCPOA

Anyhow, the question is raisesd here that why France, Germany and UK are eager to preserve the deal. For sure, they pretend to be peaceniks who care about other countries, but the fact is that their support and that of the European Union for the JCPOA is basically rooted in self-interest. Yes! For them, the JCPOA translates into dollars and valuable trade with Iran. It should be noted that the European Union was Iran’s largest trade partner before the imposition of sanctions and clearly has an interest in recovering that position.