They will prevent Tehran from using the $100-plus billion in previously frozen oil revenues that will be released under the JCPOA to go on a buying spree next year for advanced conventional weaponry and ballistic missile technology. Although Iran will seek to evade the renewed restrictions, Russia and China voted for them and, together with other U.N. members, will be bound to enforce them. Although the arms embargo does not cover all categories of arms (air defense systems such as the S-300 are not included), neither Russia nor China is expected to sell Iran the weapons that are covered, such as high-performance aircraft.