A regular meeting between parties involved in the Iran nuclear deal will take place today in Vienna. It comes one day after US and European officials, namely British, French and German, met in Berlin. Trump delivered an ultimatum to the European powers in January. He said they must agree to "fix the terrible flaws of the Iran nuclear deal" or he would refuse to extend US sanctions relief on Iran. According to the pact, Iran is to restrict its nuclear program in return for relief from sanctions that have crippled its economy.