After the collapse of its South Vietnamese ally, Taipei initially maintained a policy of zero contact with Vietnam, not even private trade and postal contact; furthermore followed by the 1987 Lieyu massacre with innocent Vietnamese refugees suffered. This left it ill-placed to take advantage of the rapid deterioration in relations between Hanoi and Beijing, even during the Sino-Vietnamese War and its aftermath. For its part, Vietnam, like other socialist states, expressed displeasure with Beijing in foreign relations by siding more closely with its rival in the Communist bloc, Moscow; for a socialist country to have contact with capitalist Taipei was unthinkable. However, in the late 1980s, as the Cold War thawed, contact between Hanoi and Taipei slowly resumed; indeed, observers saw this as one of the key events indicating the end of the Cold War in the region.