Your excellency, I am pleased to report that thanks to our foreign policies, our country has produced a developer unit for overseas exploitation!

You may send your developer to buy land spaces in any Minor Nation where you have an embassy. Once you bought the land, you may send other civilians there to develop it. When the host nation sells resources you developed, you will receive a share of the profits (proportional to how good your relationship is). 

The profits appear in the Deal Book as ‘Overseas Profits’.