During the 1980s the PRC was in talks with several Western firms regarding various aerospace and military projects, but since 1989 the PRC has had an embargo placed against it due to Tienanmen Square. Despite the historically poor relations between the PRC and Soviet Union, this has meant that the PRC has gone on to become a major purchaser of Russian and Ukrainian aerospace and military equipment, technology, and consulting since the end of the Cold War. If Tienanmen Square had not happened, might the PRC have gone on to make more extensive use of Western technology for developing its aerospace and military industries?