SHARE Containment, rather than breakthrough, may be the theme of the talks being held in Vienna between Iran and the five permanent UN Security Council member states plus Germany. The purpose of the negotiations is to revive the nuclear deal signed by the same group of countries in 2015. In parallel, Iranian escalation against the US – a member of the so-called “P5” alongside Britain, China, France and Russia – cannot be ruled out, as such a scenario would serve Tehran’s interests ahead of its presidential election in June. China and Russia, both allied to Iran, seem to have approached these talks slightly differently.