Nyorera kupfuurira kweiyi ndima - Soviet Union yakatenda kuti nzira yekusunungura yaizogumisa hutongi hwehurumende munyika uye musi wa21 Nyamavhuvhu 1968, mauto eWarsaw Pact akapinda
. Gare gare, kururamisa kweSoviet nokuda kwokupinda kwacho kwaizozivikanwa seBrezhnev Doctrine.