<prompt> Bhala okuqhubekayo kwalesi sigaba - ISoviet Union yayikholelwa ukuthi inqubo yokukhululwa kwezomnotho yayiyophelisa ubuSoshiyali bezwe kuleli zwe futhi ngo-21 Agasti 1968, amabutho eSivumelwano SaseWarsaw ahlasela  <response>: . futhi. Kamuva, isizathu samaSoviet sokuhlasela saziwa ngokuthi iBrejnev Doctrine. 