Theories on the origin of the Korean War are broadly divided into two schools. Traditionalist narratives emphasize that the war was a premeditated Southward invasion planned by Stalin, supported by Mao Zedong and prepared and executed by Kim II-sung of North Korea. Revisionist scholars, conversely, propose an interpretation that contextualizes the war within internal conflicts in the South and the external influ­ence of the U.S. hegemonism. The Soviet diplomatic documents declassified in 1991, however, reveal that Stalin, giving "29-day Operation Plan" to North Korea, demanded it to quickly occupy and communize the whole Peninsular and that Stalin gave Kim his final approval for the invasion. Other historical facts also further strengthen the argument for a deliberate North Korean offensive. In 1946, the Korean People's Army established its General Headquarters and introduced compulsory military service, thus securing troops twice the number of the South as well as fighters and tanks provided by Stalin. Though the falseness of the revisionist narratives has been unmistakably revealed like this, revisionists still cleverly evade mentioning the Southward invasion, arguing that who attacked first does not matter.