The Russian government lifted its ban on the delivery of the S-300 air defense system to Iran on April 13.  The S-300 (Antey-2500) is a long-range surface-to-air missile complex that is mobile and able to target aircraft and missiles.  Russian Foreign Minister Sergei Lavrov said the S-300 system did not fall under the U.N. arms embargo and that Russia had voluntarily implemented the ban.  The ban had been put in place in 2010 by then-Russian President Dmitri Medvedev.