Also in September 2009 it was reported that an East European network of the Joint CIS Air Defense System was to be set up by Russia and Belarus. This network was intended to protect the airspace of the two countries as defined in the supranational 1999 Union State treaty. Its planned composition was to include five Air Force units, 10 anti-aircraft units, five technical service and support units and one electronic warfare unit. It was to be placed under the command of a Russian or Belarusian Air Force or Air Defence Force senior commander.