Can southern Europeans ping well to northern African countries (and vice-versa)? Cause if so, you guys could pull a Hitler and invade those African countries. You could also spread east from south-eastern Europe, and from north-eastern Africa (once the area is secured), into the middle-east. If from Japan, Korea and China, the scene spreads west, we could have almost all of Asia, plus Europe and large parts of Africa.

With the geography of Europe, Asia and Africa, if you build a stronghold in one region, you should be able to spread from there to the other regions. It's all about developing areas based on ping. If you ping well enough to a nearby region, you can invite that region into the community, without the need for them to build a community from scratch.