Finland and Yugoslavia could trade relatively freely with both the western and eastern blocs. Yugoslavian trade was stopped by Reagan, then IMF, conflicts, civil war. Finland had no reason to seek help from IMF in the early 90ies as their problem was that IMF reforms were killing their market.

Afghanistan was border territory first between the Russian and the Brittish empires, then between east and west. Trading position destroyed by war.

I believe Hong Kong was one of few places to trade freely with the west and with China.

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