His son Motjaba (Khamenei) hasn't been seen since he was supposed to succeed his father," he said.Two major sticking points in the peace talks — Iran's stockpile of near-weapons-grade enriched uranium and the future of the Strait of Hormuz — appear to be up in the air.US-Israeli strikes have targeted Iranian military and nuclear research sites, with Trump saying the state's navy has been obliterated, reducing Iran's ability to control the strait.Professor Kevin Rowlands, a former Royal Navy officer at the Royal United Services Institute, told ABC radio on Tuesday morning that Iran has a firm group on the key shipping route.He explained that it's a maritime wing of the Iranian Revolutionary Guard Corps (IRGC), and not the state's navy, that has been targeting the strait."It's that [IRGC] core that is using different kinds of guerrilla or insurgent tactics in small boats using drones, dropping mines, to put pressure on seafarers, users in the Strait, the Americans, the Gulf states, and keep it closed that way," he said."I think they've got a range of pretty unsophisticated capabilities, but they're using them in a very sophisticated way But Rowlands said the situation will remain "tense" while the US maintains its naval blockade near the Strait's entrance.While it appears designed to put pressure on Iran to agree to a deal, Rowlands said that's unlikely, as blockades are "not a quick win"."If you are imposing a maritime blockade, what you're trying to do is damage and weaken the economy and the will of the people