<prompt> Bhala ukuqhubeka kwalesi sigaba - Ngo-1968, uStětina waqala ukusebenza njengentatheli ephephandabeni iMladá Fronta, umsebenzi wakhe lapho waqondana nokuhlala kweSoviet eCzechoslovakia  <response>: , lapho ibutho laseSoviet lathatha khona ukulawula iMladá Fronta. UStětina wabe esexoshwa ngenxa yokungavumelani kwakhe namabutho aseWarsaw Pact angena eCzechoslovakia. 