EC and COC Alliance

The EC and COC Alliance is the Alliance between Eroclera and Cocania. Both of these countries help support each other through trade, war, and military. Eroclera is a very wealthy country and helps Cocania with military funding and anything else that's related. In return, Cocania helps fend off countries that may be enemies.
 * Cocania is the closest ally to Eroclera and both depend greatly on each other.
 * Cocania is a much larger country than Eroclera but both are very strong nations.

How can two countries, one that's the size of Sweden and the other that's the size of Switzerland, be such good allies? Who knows.