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brezhnev control ensured soviet control over?

enforced by?

doctrine formulated after soviet intervention where in which year

to prevent czech communist gov from introducting what?

threat of soviet intervention played important role inwhich gov's response to protests in '80-'81?

in order to avoid soviet invasion what did leader general jarulzelski impose?

what happened to unrest?

however what did gorby decide he wouldn't uphold?

when was the funeral of chernenko?

which provided gorby with opportunity to do waht?