Iranian nuclear negotiators arrive in Istanbul , Turkey , for talks . Iran could bring `` new initiatives '' to the discussions , its top negotiator says . Comment: Iran is under intense pressure to rein in its nuclear program .
Iranian nuclear negotiators arrive in Istanbul , Turkey , for talks . Iran could bring `` new initiatives '' to the discussions , its top negotiator says . State media says Iranian officials are not encouraged going into the meeting . Iran is under intense pressure to rein in its nuclear program .