Russia\'s Deputy Foreign Minister Sergey Ryabkov on Friday one again warned Western countries on imposing anti-Iran sanctions. Talking to Echo Moscow radio station, Ryabkov said imposing unilateral sanctions on Iran had reached a \'dead-end.\' He said escalation of anti-Iran pressure \"gets nowhere\", adding that negotiation was the only opportunity to settle Iran\'s nuclear issue. Ryabkov underlined that the negotiations of the 5+1 group (US, UK, China, Russia, France and Germany) were fruitless, \"because some members of this group have no clear understanding about the point that nobody would tolerate sanctions\".