Informations in this documentary about Specnaz involvement in 1968 invasion to Czechoslovakia are simply not true. They only managed to secure airport and failed in all other tasks (tv, radio, members of the Central Committees). And political leaders moved to Moscow by train? No.
Btw Czechoslovak army SF planned daring raid on Prague to free president and other political figures, but learned that they were flown to USSR to negotiate.
Thanks for posting anyway