You can setup the tier pricing to appear only to customers from specific countries. During tier pricing setup, please enable the "Only apply tier pricing to the following countries" checkbox:
Next, from the dropdown, select the country/countries (you can select more than 1) that you wish the tier pricing to be applied to:
If two tier pricing for different locations features the same product, only the tier pricing created later will take effect on the product.
We will be enhancing in future updates to this feature so that two different locations can feature two different sets of tier pricing and discounts.