"Foreigners do not have any say in this."

That's a load of horseshit.

Foreigners were the lever used to end the Apartheid regime in South Africa due to the divestment movement which cut off economic support to the South African government, effectively forcing it to change.

This happened not only against the wishes of the South African government but also against the wishes of much of the then-American government (under Reagan).

Of course foreigners have a say in this, if they have the will to act upon their principles.