Claiming land is yours because there are people from your country there is textbook fascist strategy.

To offer an example, this was Hitler’s basis for invading and annexing the Sudetenland, part of what was then Czechoslovakia.

Not exactly. The official pretext for annexing Sudetenland was a simple rescue mission: saving Sudeten Germans from purported ‘Czech atrocities’. Practically, though, it was clear that annexing Sudetenland would bolster the Fascist bourgeoisie’s German empire. For example:

The overcoming of the Czechoslovak barrier would make more probable easy access for Germany to one great source of petrol, the Rumanian oilfields; and the fall or circumventing of the second barrier — Turkey — would open the door to a second great source, in Irak and Persia, which would be the last stage on the road to India.

In addition to these strategical considerations, the occupation of Czechoslovakia, following that of Austria, and the further consequent possibilities, would also add the great heavy industries of Czechoslovakia and Polish Silesia, the great food resources of Hungary and Rumania, and an enormous new source of manpower to the economic potential referred to earlier.

(Source.)