how to use azure network across geos / regions

hi folks, 

how do i link two virtual networks across multiple geos or better can i (could not find a way to do this) use a single virtual network across multiple geos without any external devices to route traffic between the two networks?

i want to have an application in multiple geos - some aspects of it (like an appserver , may be even an lb) and send people from various geos to a geo closeby.

The issue is : i would like to access some common resources in geo A from geo B.  Can i use the same virtual network to do this ?

If not , if i create a second virtual network, will the address space of the first virtual network be accessible from the second?

If not, do i have do something extra do make this happen ( i do not want to use the public vip from geo A to geo B).

Multiple questions, but they are all related :)

Regards,

kram123