EghtesadOnline: Who speaks for Donald Trump on foreign affairs? Is it Secretary of State Rex Tillerson? Vice President Mike Pence? Or the president’s Twitter account?

EghtesadOnline: World leaders paid tribute on Saturday to Fidel Castro, the Cuban revolutionary leader who built a communist state on the doorstep of the United States, but in death just as in life he divided opinion, and critics labeled him a "tyrant".

EghtesadOnline: World leaders offered to work with Donald Trump when he takes over as U.S. president, but expressed anxiety over how he will handle problems from the Middle East to an assertive Russia and whether he will carry out a number of campaign threats.

EghtesadOnline: A new escalation in tensions between Iran and the United States has prompted global alarm and a plea for both countries to exercise restraint and pursue diplomacy rather than going down the path of confrontation.

EghtesadOnline: Twitter Inc. won’t attribute a bump in activity on its platform to U.S. President Donald Trump’s prolific usage. But the president’s tweets certainly put the company in the spotlight, Chief Operating Officer Anthony Noto said.

EghtesadOnline: Foreign Minister Mohammad Javad Zarif in a Tweet on Friday called on world leaders to promote dialogue and compassion in the world.

EghtesadOnline: Iranian President Hassan Rouhani has met with British Prime Minister Theresa May for the first time.