How about a little contest between the countries?
It could work completely like a Clan - every person (maybe) has a clan and a country to play for. The countries then compete for monthly energy, tourneys or whatever. Should be kinda simple..
Another was is to have one bot for each country. The bot has the same exp as the total of the 10 or 20 highest exp players from that country, and something similar with STR, DEX and CON and maybe energy.
Which country can build the strongest bot?