Iranian nuclear negotiators are in Istanbul , Turkey , for talks . Iran could bring ` ` new weapons '' to the discussions , its top negotiator says . State Department says Iranian officials are not happy going into the talks . Last month , the IAEA noted what it called a sharp and troubling increase in Iran 's uranium enrichment capabilities . Iran is under intense pressure to rein in its nuclear program .
Iranian nuclear negotiators are in Istanbul , Turkey , for talks . Iran could bring ` ` new weapons '' to the discussions , its top negotiator says . State Department says Iranian officials are not happy going into the talks . Iran is under intense pressure to rein in its nuclear program .