Looking for finished story
Setting: present
Sci fi fantasy
World invasion by "bugs"?, retaliation from MC, MC brings planet into space community
I do remember one chapter where earth ambassadors try to communicate to an aggressive alien species who view earth as weak, earth embassadors almost get killed, MC jumps in to the "negotiations" and basically beats their ambassadors like a fat guy at an all you can eat buffet, then tells them "You can either negotiate with them or you can negotiate with me"

The negotiation sounds a lot like Coeus? -> http://royalroadl.com/fiction/4745/coeus In chapter 58 is the "negotiation".

That's the one, Thanks