Since the collapse of the former Soviet Union, an increasing number of formerly isolated nations have become opened to the world. Almost overnight, millions of potential buyers who were locked off for decades suddenly become exposed to the international economy. Yet even today, a handful of these potential markets remain cloistered away: Cuba, Iran, North Korea. What are the challenges and opportunities presented in these nations? Automotive News spoke to executives who were on the ground for the openings of key markets -- from the fall of the Berlin Wall and onwards -- about their experiences constructing in a new market.