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Let say that in 1971 the leadership of the USSR made a plan for retaliation against the United States, should the russians ever loose the Cold War.
The KGB sees the World Trade Center as symbol of America dominance and Capitalism and decides it must be the main target in "Operation Blacknight". Codename for the what eventuelly becomes 9/11.
To disguise their russian involvement KGB approach extremist Muslim elements in Middle East in 1973 during the arab/Israely war a the plan is set in motion.