Revolutionary Guard doubles down on denial that its aircraft was shot down in Strait of Hormuz while approaching an American vessel

In response to proposal, US official says Iran must stop enriching uranium and negotiate deal that includes a permanent end to nuclear ambitions

Tehran's foreign minister says six-block radius cap creates 'inhuman conditions' for diplomats and their families; international body says it has 'concerns'

Zarif tells conference that sanctions amount to 'targeting innocent civilians' as Washington sharply restricts his movements during New York visit

Spokesman says Zarif's comments conditioning talks on Washington ending weapons exports to the region 'threw the ball into the US court'

Tehran's UN mission says media outlets mischaracterized 'hypothetical' remarks by FM Zarif

Pentagon officials suspect Tehran targeted vessel amid heightened tensions over unraveling nuclear deal

Concerns rise after tracking data shows ship Riah, sailing through Strait of Hormuz, stopped transmitting its location over two days ago

But Zarif conditions negotiations on US first ending arms sales to Saudi Arabia and the UAE, making the idea a likely nonstarter

World body conveys message to US over Washington limiting Zarif, in New York for sustainability conference, to six block radius around Iranian UN mission in Manhattan