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Because, at the time, the world still ran by Cabal rules. Either you played the Cabal game, or you were 'handled'. Russia probably thought that they had no choice, if Russia proper was ever actually involved. They have their own oligarchy problems over there and clowns galore, I suspect.
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Because, as Q has indicated, both North Korea and Iran are essenitally Cabal "rogue states" meant merely to instigate a world war. The North Korean one has been dismantled and now the Iranian one has been dismantled.
Basically, North Korea, Iran, and many other "rogue state" countries are not countries as we think of them, but secret parts of the Cabal that already controlled much of the world, to instigate wars on false pretenses.
Everyone should read War is a Racket.