Turkish Foreign Minister Mevlut Cavusoglu condemned the U.S. move to designate Iran's Revolutionary Guards a "terrorist group."
"These kinds of decisions will pave the way for instability in our region," AFP cited Cavusoglu as saying.
According to him, the decision against the "official army of Iran... was incomprehensible."
The minister also criticised previous "one-sided" American sanctions against Iran and "pressure" on other countries by Washington to adhere to them.
Washington's move against the Revolutionary Guards was the first time that the United States has branded part of a foreign government a terrorist group.