Efforts to revive the US-Iran nuclear deal have reached a dead end, according to a senior US State Department official speaking on the sidelines of the UN General Assembly on Friday . Efforts to breathe new life into the troubled deal have hit the buffers several times in recent weeks, as both sides have placed responsibility for finding compromise with the other party. “In a nutshell, we’ve hit a wall because of Iran’s position,” said the official, whose name was redacted on the State Department website. On Thursday, Iranian President Ebrahim Raisi said that he saw no future for the deal with…