The Russian government has approved an agreement with Armenia to establish a joint regional air defense in the Caucasus, a decree published on the official portal for legal information Monday stated.

At the time of the signing, the regional air defense force was estimated to incorporate 19 aviation units, 47 anti-aircraft missile systems, 19 radio-technical units and three separate electronic warfare battalions.

"Approve and submit for ratification to the Russian president the agreement between Russia and Armenia to establish a joint regional air defense in the Caucasus region of collective security, signed in Moscow on December 23, 2015," the decree reads.