Iran has faced suspicion for decades over its nuclear ambitions and whether it’s developing the capability to fire an atomic weapon.

The Treasury sanctions are directed at more than a dozen people and companies based in China, India and the United Arab Emirates.

Tension is escalating between the U.S. and Iran over its nuclear ambitions. On Tuesday, President Donald Trump signed an executive order to sanction Iran over their development of nuclear weapons and their exporting terrorism through proxy groups.