Unique distinct alphabetically sorted list

Hello,

I have a list I wish to sort by alphabetic order.
I also have two criteria though;

Attached is an example file...

I have a list of countries in column A, and a list of sites in column B.
I already made a unique list of countries (column D, in the example) out of the list in column A, and this list is a bridge-step so I can have the countries names as headlines (Row 1, column F-J) – if anyone can offer me a formula to have it directly to the headline spots (without using column D, that will be great as well) – as you can see I left additional 2 spots as headlines (in blue) for future update.

In the yellow section I want to have the unique list of sites per country (alphabetically order), I managed to build a formula that returns every site within the specific country but with duplicated values (with Index formula), I can't find a way to have it as a unique list).

Your assistance is much appreciate.

Thanks.