Just days after US President Donald Trump called for further isolation of Iran, a Norwegian solar company signed a deal to invest 2.5 billion euros in the country over the next five years.

"Norway is fully committed to the JCPOA (nuclear deal) and this is proof that we have taken the opening very seriously, and we will see more investment very soon," Norwegian ambassador Lars Nordrum told AFP at the signing in Tehran between Norway's Saga Energy and Iran's Amin Energy Developers.