Analysis of information sources in references of the Wikipedia article "Warsaw Pact" in English language version.
In the morning hours of August 21, 1968, Soviet and Warsaw Pact tanks roll in the streets of Prague; to distinguish them from Czechoslovak tanks, they are marked with white crosses.
Treaties approving Bonn's participation in NATO were ratified in May 1955...shortly thereafter Soviet Union...created the Warsaw Pact to counter the perceived threat of NATO
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: CS1 maint: archived copy as title (link)In the morning hours of August 21, 1968, Soviet and Warsaw Pact tanks roll in the streets of Prague; to distinguish them from Czechoslovak tanks, they are marked with white crosses.
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: CS1 maint: archived copy as title (link)