Whakaotihia te rerenga e whai ake nei: I te tau 1968, i te wa i tohua ai te kaiwhakawhanake a Alexander Dubček ki te tūranga matua o te Hekeretari Tuatahi o te Rōpū Communist o Czechoslovak, he wa poto o te whakawheratanga e mohiotia ana ko te Prague Spring. Hei whakautu, i muri i te kore o nga kaiarahi o Czechoslovak ki te whakarereke i te huarahi, e rima atu o nga rangatira o Czechoslovak
i whakaekehia e nga mema o te Paati o Warsaw. I uru mai nga taakahi Soviet ki Czechoslovakia i te po o te 20 ki te 21 o Akuhata 1968. Ko te Hekeretari Matua o te Rōpū Communist o Soviet Leonid Brezhnev i kite i tenei whakauru hei mea nui mo te tiaki i te Soviet, te punaha pāpori me te oati ki te whakauru atu ki tetahi kawanatanga e whai ana ki te whakakapi i te Marxism-Leninism ki te whakapaipai.