Text: We did this even though the white South African government was a staunch U.S. ally in the Cold War, while Nelson Mandela's African National Congress had extensive Communist and Soviet ties.
Entailment: Even though the white South African government was a staunch U.S. ally in the Cold war, we still did this.
Contradiction: We did not do this, because the white South African government was a fierce enemy of the United States.