FILE PHOTO: Iranian Foreign Minister Mohammad Javad Zarif speaks to the media in Tbilisi, Georgia, April 18, 2017. To match Special Report USA-IRAN/STUDENT REUTERS/David Mdzinarishvili/File Photo

LONDON (Reuters) - Iranian Foreign Minister Mohammad Javad Zarif accused the United States on Wednesday of bullying even its own allies, as he arrived in Turkey which is locked in a row with Washington.

The United States has doubled tariffs on Turkish steel and aluminum imports over the detention of an American Christian pastor, with Ankara responding with its own retaliatory measures even though both countries are NATO allies.

“The Americans have shown they have no limit or boundary in imposing pressure and using force on others, even on their own allies,” Zarif said in Ankara.

“Turkey and some U.S. allies in Europe have come to the conclusion that the United States is not a trustworthy partner,” Zarif was quoted as saying by the Iranian state news agency IRNA.

Washington is imposing waves of much severer sanctions on Iran following its withdrawal from a 2015 international deal curbing Tehran’s nuclear program.

Zarif is in Turkey to meet Turkish President Tayyip Erdogan, who is due to visit Iran on Sept. 7.