Start by naming any country that France borders. Then name any country that borders any of those countries. Then keep going until there are no more countries left to name.
Sudan isn't called North Sudan. South Sudan contains the whole name of Sudan. On the other hand, there isn't a country just called Korea, so neither would count.
I may reconsider the abbreviations rule.
Republic of "Korea"
North Korea's real name:
Democratic Republic of "Korea"