As Opposition Members are pointing out, the withdrawal of Cuban forces does not form any part of resolution 435, as my right hon. Friend knows. Nor do we recognise it as a precondition for a settlement. The South Africans have made it clear that they will not agree to the implementation of resolution 435 unless a way of implementing the withdrawal of Cuban forces is found. It is to that end that the United States-led negotiations have been and continue to be directed—not helped by the recent incident, which we all deplored, at Cabinda.