With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: On the night of 20–21 August 1968, military forces from every Warsaw Pact member state (except for Albania and Romania) entered Czechoslovakia. The occupying armies quickly seized control of Prague and the Central Committee's building, taking Dubček and other reformers into Soviet custody. But, before they were arrested, Dubček urged the people not to resist militarily, on the grounds that "presenting a military defense would have meant exposing the Czech and Slovak peoples to a senseless bloodbath". Later in the day, Dubček and the others were taken to Moscow on a Soviet military transport aircraft.
text_B: Is it likely that at least one Warsaw Pact country had qualms about invading Czechoslovakia?
YES.