German Foreign Minister Frank-Walter Steinmeier has told Iran it must halt uranium enrichment if it wants to negotiate with world powers on its nuclear programme.But the response from his Iranian counterpart Manouchehr Mottaki – that talks must be “without pre-conditions” – suggests little movement in the two sides’ positions following today’s talks in Berlin. Iran is considering a package of incentives offered by UN Security Council members and Germany, aimed at getting the Islamic Republic to stop enrichment. In exchange for a suspension, Security Council powers have agreed to halt work on a resolution that could impose sanctions. Amid tight security, police kept Iranian dissidents protesting the visit away from the venue. Washington and its allies suspect Iran’s nuclear enrichment activities are a cover for a weapons programme. Tehran insists its intentions are purely peaceful.