The US Navy said its vessels were taking photos of the surrounding environment and had been in the vicinity of the southern Red Sea for more than 200 days.
Turkey issued an international arrest warrant in April last year for fugitive businessman Faruk Fatih Ozer, who fled with a reported $2.0 billion in investors' assets.
The 2015 deal, known formally as the Joint Comprehensive Plan of Action, aimed to prevent Iran from developing a nuclear weapon something it has always denied wanting to do.