Upgrading Surveillance Equipment Complicates Iranian Nuclear Deal Listen Download Embed Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email Foreign ministers from major powers began crunch talks in Vienna on Monday seeking to seal a historic nuclear deal to end a 13-year standoff, one day before a final deadline, officials said. ( Carlos Barria / Getty ) Produced by Ellen Frankman Produced by PRI and WNYC