Leupold has been importing their glass from Japan for a long time.
The scopes/lenses are assembled, for the most part, in their Pacific Northwest production facility. They also gas seal and check them by sinking their scopes in a big tank of water and induce pressure.
I have not heard that they are importing completed scopes, but Leupold has some of the best scopes in the business, plus their lifetime-no-matter-who-owns-it warranty is one of the best out there, IMO.
Contact Leupold - They will shoot you straight.