For decades, masterpieces by the likes of Pablo Picasso, Vincent Van Gogh, Andy Warhol and Jackson Pollock have been kept in the basement of a museum in Iran's capital Tehran, shrouded in mystery.

"Their talks are not aimed at solving problems," said Supreme Leader Ayatollah Ali Khamenei, without mentioning the United ...

In 2018, Trump withdrew the U.S. from Tehran's 2015 nuclear deal with world powers and reimposed sanctions that have crippled Iran's economy. Tehran reacted a year later by violating the deal's ...