The US cannot sustainably force the EU to suspend trade with a third country. Sanctions, at least employed in this way, is a weapon which use reduces its effect

The US cannot sustainably force the EU to suspend trade with a third country. Sanctions, at least employed in this way, is a weapon which use reduces its effectiveness. Like everything the Trump administration does, reneging on the JCPoA represents an extreme trade-off in favor of short-term gain at greater expense in the long-term.